Does Privilege Extend to Non-Legal Professionals Advising on Legal Issues Relating to Their Field?
April 2026 | An educational guide for business clients
Introduction
Legal professional privilege (LPP) is one of the most fundamental protections in English law. It enables clients to communicate freely and confidentially with their lawyers, safe in the knowledge that those communications cannot be compelled as evidence against them or disclosed to third parties, whether in litigation, regulatory investigations, or other adversarial contexts. The privilege is not merely a procedural technicality — the courts have repeatedly described it as a fundamental common law right, capable of being abrogated only by clear statutory language.
For businesses navigating complex regulatory environments, a question of considerable practical importance arises: does this protection extend beyond qualified lawyers to other professionals who regularly advise on matters with substantial legal content? Accountants advise on tax law. Surveyors advise on planning compliance. Patent agents advise on intellectual property rights. Compliance officers advise on regulatory obligations. In each case, the professional may be providing advice that is deeply legal in character, yet doing so without a qualification in law. The question is whether LPP follows the legal substance of the advice, or whether it attaches only to the professional status of the advisor.
The short answer, established by the Supreme Court in Prudential Plc v Special Commissioner of Income Tax [2013] UKSC 1, is that privilege does not, as a general rule, extend to non-legal professionals merely because they advise on issues that happen to have legal dimensions. The privilege belongs to the qualified lawyer, not to the subject matter. However, the position is considerably more nuanced than this simple statement suggests, and there are important exceptions, qualifications, and practical strategies that business clients should understand if they are to protect their sensitive communications effectively.
1. The Foundations of Legal Professional Privilege
English law recognises two distinct forms of LPP. The first is legal advice privilege, which protects confidential communications between a client and their lawyer made for the purpose of giving or receiving legal advice. The second is litigation privilege, which is broader in scope and covers confidential communications between a client, their lawyer, and third parties made for the dominant purpose of litigation that is reasonably anticipated or already under way. Both forms of privilege are absolute in the sense that, once established, they cannot be overridden by a balancing exercise or by considerations of the public interest in disclosure — though this absoluteness has faced judicial scrutiny.
The House of Lords in Three Rivers District Council v Bank of England (No 6) [2004] UKHL 48 confirmed that legal advice privilege is confined to communications between a client and a qualified lawyer acting in their professional legal capacity. This important restriction means that the lawyer must be giving advice as a lawyer — applying legal knowledge and judgment to the client’s situation — and not merely acting in some other capacity, such as a business consultant, commercial advisor, or trusted confidant. Where a solicitor acts outside their legal function, their communications will not attract privilege even though they hold legal qualifications.
It is also important to note that legal advice privilege applies to the continuum of confidential communications between lawyer and client in a legal context — not only to specific documents that contain formal legal advice. As the Court of Appeal stated in Balabel v Air India [1988] Ch 317, privilege extends to documents passing between lawyer and client as part of a professional relationship where legal advice is being sought or given, even if individual documents do not themselves contain explicit legal advice. This generous interpretation of the scope of privileged communications sits alongside the strict requirement as to who can attract the privilege in the first place.
2. Why Non-Legal Professionals Generally Cannot Attract Legal Advice Privilege
The rationale for confining legal advice privilege to qualified lawyers is both principled and practical. The privilege exists because society has determined that the administration of justice requires individuals to be able to seek legal advice without fear that their candid disclosures will be turned against them. This rationale is grounded in the special relationship between lawyer and client: one governed by formal legal qualifications, professional regulation, strict duties of confidentiality, and the institutional structure of the legal profession. Without these features, the justification for absolute privilege — as opposed to ordinary professional confidentiality — is significantly weakened.
Accountants offer the paradigm case. A tax accountant advising a client on the tax implications of a proposed transaction is clearly advising on matters with significant legal content — tax law is law. Yet the courts have consistently held that such advice does not attract legal advice privilege. In R v Special Commissioner and Another, ex parte Morgan Grenfell & Co Ltd [2002] UKHL 21, the House of Lords confirmed this position in unambiguous terms. The definitive resolution came, however, in Prudential Plc v Special Commissioner of Income Tax [2013] UKSC 1, where the Supreme Court considered at length whether legal advice privilege should be extended to non-lawyer professionals providing legal advice.
In Prudential, the taxpayer argued that its communications with accountants regarding tax law should attract privilege on the grounds that the accountants were providing genuinely legal advice within a field of recognised expertise. The Supreme Court, by a majority, refused to extend the doctrine. Lord Neuberger, delivering the leading judgment, acknowledged the considerable force of the argument that suitably qualified professionals providing legal advice should enjoy equivalent protection, describing the present state of the law as ‘unsatisfactory’ in certain respects. Nevertheless, the majority concluded that extending privilege to non-lawyer professionals was a matter for Parliament rather than for the courts, and that the existing doctrine’s confinement to qualified lawyers represented a principled and workable boundary that the courts should not disturb. The minority, led by Lord Sumption, considered the case for extension compelling, but that view did not prevail.
The Prudential decision remains the governing authority in English law. Parliament has not legislated to alter the position, and so the law as it stands is clear: however sophisticated and legally focused the advice given by a non-qualified professional, it will not attract legal advice privilege. This is true even if the professional has deep domain expertise, holds relevant qualifications in their own field, and is advising on matters that are indistinguishable in legal content from advice a solicitor might provide.
3. Important Exceptions and Qualifications
While the general rule is clear, there are several important exceptions and qualifications that may, in specific circumstances, bring the communications of non-legal professionals within the scope of privilege. Each of these deserves careful consideration.
3.1 Statutory Privilege for Certain Professions
Parliament has created statutory privilege for a small number of professional groups whose functions are sufficiently closely related to legal practice to warrant equivalent protection. The most significant examples are patent attorneys and registered trade mark attorneys. Section 280 of the Copyright, Designs and Patents Act 1988, as reinforced by the Legal Services Act 2007, grants patent attorneys the same privilege as solicitors in respect of communications relating to patent matters. Similar protection applies to registered trade mark attorneys in relation to trade mark work. These statutory extensions reflect a considered legislative judgment that these professions exercise quasi-legal functions in highly technical areas, hold formal qualifications within their respective regulatory frameworks, and are subject to professional conduct obligations comparable in relevant respects to those governing solicitors.
The Legal Services Act 2007 also created a framework within which certain non-solicitor entities may provide reserved legal activities under appropriate authorisation. To the extent that such providers are authorised to carry out those activities, their qualifying communications may attract LPP. However, the scope of this protection is coextensive with the legal activities authorised — it does not confer general privilege on all communications by an authorised body.
3.2 Litigation Privilege and Third-Party Experts
Litigation privilege has a considerably broader scope than legal advice privilege, and it can extend to confidential communications with third parties — including non-legal professionals such as expert witnesses, forensic accountants, medical experts, technical specialists, and others — provided two conditions are met. First, litigation must be reasonably anticipated or already under way. Second, the communications must have been made for the dominant purpose of use in that litigation. This dominant purpose test is the critical gateway.
In practice, this means that a forensic accountant instructed to analyse financial records for use in anticipated fraud proceedings, or a medical expert retained to prepare a report for use in personal injury litigation, may have their communications with the instructing party protected by litigation privilege. The same accountant’s routine tax compliance advice, however, will attract no such protection, because that advice is not generated for the dominant purpose of litigation. The distinction between an expert engaged for litigation purposes and the same professional performing their ordinary advisory function is therefore of the greatest practical importance, and businesses should take care to establish and document this distinction clearly from the outset of any engagement.
3.3 Non-Legal Professionals as Agents of the Lawyer
English law recognises, in limited circumstances, that where a non-legal professional acts effectively as an agent or conduit for communications between lawyer and client, their involvement does not break the chain of privilege. The underlying principle is that a privileged communication does not lose its character merely because it passes through a necessary intermediary. In Wheeler v Le Marchant (1881) 17 Ch D 675, the Court of Appeal acknowledged this principle in the context of surveyors whose communications were sought as part of litigation. The more modern articulation is that a third party whose involvement is necessary to enable the lawyer to give legal advice — in the sense that the lawyer could not effectively advise without the third party’s input — may be regarded as part of the privileged channel.
This principle is, however, narrower than it may at first appear. A non-legal professional engaged directly by a client to perform what is substantially their own independent advisory function — even if that function informs the legal advice subsequently given by a solicitor — will not benefit from privilege. The courts look to substance rather than form. Routing all non-lawyer communications through a solicitor’s email address, or labelling them as ‘legal advice’, will not confer privilege where the underlying reality is that the professional is performing an independent commercial or technical function. Courts have repeatedly refused to permit artificial structures designed to dress non-privileged material in the appearance of privilege.
3.4 The US Position: The Kovel Doctrine
For businesses with operations in the United States, or involved in cross-border disputes, it is instructive to consider the approach taken in US federal law. The Second Circuit’s decision in United States v Kovel 296 F.2d 918 (2d Cir. 1961) established the so-called Kovel doctrine, under which the attorney-client privilege can extend to non-lawyer professionals — including accountants — if they are retained by the lawyer (not independently by the client), and their role is to facilitate the lawyer’s provision of legal advice by enabling the lawyer to understand and communicate complex technical information. Judge Friendly’s famous analogy was with a foreign language interpreter: just as privileged communications do not lose their character because they pass through a translator, they should not lose their protection merely because they are communicated in the ‘language’ of accountancy.
The Kovel doctrine is, however, considerably narrower in application than its elegant formulation might suggest. US courts have frequently refused its protection where accountants or other professionals were engaged primarily for independent business purposes, where the retainer was with the client rather than genuinely with the lawyer, or where the professional’s primary function was not to assist legal advice but to perform their own commercial role. English law has not formally adopted the Kovel doctrine, and the Supreme Court in Prudential did not consider it a model to be followed. Nevertheless, its underlying logic — that a necessary technical intermediary does not break the privileged channel — finds some echo in the English agent principle described above.
4. Practical Implications for Business Clients
4.1 Tax, Regulatory, and Compliance Advice
Businesses routinely engage accountants, tax advisors, compliance consultants, and regulatory specialists to advise on legal requirements in their respective domains. None of this advice will be privileged as such, regardless of how legal in character it may be. In the event of an investigation by HMRC, the Financial Conduct Authority, or any other regulatory body, documents containing or recording such advice will ordinarily be disclosable upon demand. This is a significant exposure that many businesses do not fully appreciate until they are faced with a formal information request.
One important structural implication is that businesses should be thoughtful about how non-lawyer advice is obtained and recorded. Where legal advice privilege is genuinely sought in respect of a legal issue, the engagement should be structured so that a qualified lawyer — whether external or appropriately acting in-house counsel — is the entity providing the legal advice, even if that advice is informed by technical input from non-lawyers. The non-lawyer’s technical analysis may not be privileged in itself, but the solicitor’s legal advice built upon it will be, provided the other conditions for privilege are met. This approach requires early and close involvement of legal counsel, not the retrospective labelling of non-lawyer advice as legal.
4.2 Internal Investigations
Internal investigations present particular complexities. When a business investigates alleged misconduct, it will commonly use a mixed team of lawyers, compliance officers, forensic accountants, HR professionals, and others. The question of which elements of that investigation attract privilege — and which do not — requires careful thought from the outset. In SFO v ENRC [2018] EWCA Civ 2006, the Court of Appeal offered important guidance on the scope of litigation privilege in the internal investigation context. Communications will attract litigation privilege if litigation is reasonably anticipated and the communications are made for the dominant purpose of that anticipated litigation. Materials generated for multiple purposes — regulatory compliance, internal governance, and litigation preparation alike — may fail to satisfy the dominant purpose test in relation to any single purpose.
In-house lawyers present a particular issue in the investigation context. In-house counsel are qualified lawyers and are in principle capable of attracting LPP. However, as the courts have emphasised, the privilege attaches only when the in-house lawyer is acting in their legal capacity, and not when they are acting as a business manager, compliance officer, company secretary, or general strategic advisor. Many in-house lawyers perform a blend of legal and non-legal functions, and it is essential that privileged legal communications are clearly identified and maintained separately from business communications. Failure to do so risks the waiver or loss of privilege over the whole body of material.
4.3 Structuring External Engagements
Where a business anticipates litigation or regulatory proceedings, the most reliable strategy for protecting sensitive communications with non-legal professionals is to ensure that those professionals are properly instructed by and through the client’s external solicitors, where circumstances permit. Retaining a forensic accountant, technical expert, or financial advisor through external counsel — rather than directly by the business — assists in establishing that the engagement is for the dominant purpose of litigation preparation, and may bring the instruction within the scope of litigation privilege. In all cases, the written terms of the engagement should clearly identify the purpose for which the professional is retained and, where applicable, the fact that they are being instructed by and on behalf of the client’s solicitors.
Where non-legal professionals must be engaged directly for ongoing operational or compliance functions — as is frequently the case — businesses should implement clear protocols for escalating sensitive legal matters to qualified counsel, and should exercise discipline in ensuring that legal analysis performed by non-lawyers is not recorded in documents that may later be subject to compulsory disclosure. While there is no substitute for proper privilege protection, thoughtful document management and communication hygiene can at least avoid the inadvertent creation of disclosable records of sensitive strategic thinking.
4.4 International Considerations
Businesses operating across multiple jurisdictions face additional complexity. Many civil law jurisdictions do not recognise an equivalent of LPP as understood in common law systems: professional secrecy obligations may exist, but they are typically conceived differently and carry different consequences. Furthermore, the protection available to in-house counsel varies significantly across jurisdictions. Following the Court of Justice of the European Union’s decision in Akzo Nobel Chemicals Ltd v European Commission [2010] ECR I-8301, communications with in-house lawyers do not attract privilege in the context of EU competition law investigations — a position that has been adopted in retained EU law in a number of jurisdictions and which reflects a long-standing tension between common law and civil law approaches to in-house privilege.
For businesses involved in cross-border investigations or transactions, this means that a document which would attract LPP in England and Wales may be entirely unprotected in another jurisdiction, and that a non-lawyer professional’s advice which has no privilege protection in England may be treated differently in some common law jurisdictions that take a broader approach. Businesses should seek jurisdiction-specific advice wherever material cross-border privilege questions arise.
5. Conclusion and Key Recommendations
The governing principle in English law is clear: legal professional privilege is the province of the qualified lawyer. Non-legal professionals — however expert, however deeply versed in the law of their field, and however legal the content of their advice — do not generally attract either limb of LPP. The Supreme Court’s decision in Prudential has settled that question for legal advice privilege, and the courts have carefully policed the boundaries of litigation privilege and the agent principle to prevent artificial extension.
The exceptions — statutory privilege for patent and trade mark attorneys, litigation privilege extending to third-party experts retained for litigation purposes, and the narrow agent principle — provide limited but important carve-outs that businesses and their advisors should understand and use appropriately. The US Kovel doctrine offers a useful conceptual comparison but is not part of English law, and businesses should be cautious about assuming that structures compliant with US privilege law will protect materials in English proceedings.
For businesses, the practical message is this: if you require the protection of legal professional privilege for sensitive communications about legal matters, involve qualified legal counsel at the earliest opportunity. Do not assume that because advice relates to legal matters, or is delivered by a professional with deep expertise in a regulated field, it will enjoy the same protection as advice from a solicitor or barrister. Structure engagements carefully, document the purpose of retaining non-legal professionals clearly, and maintain discipline in separating legal advice from business communications. Where ongoing relationships with non-legal advisors generate material that touches on legally sensitive issues, establish protocols for escalation to legal counsel before that material is reduced to writing.
The law in this area may not be entirely satisfactory — the Supreme Court itself said so in Prudential — and there is a reasonable argument, not yet resolved by legislative reform, that highly qualified professionals providing genuinely legal advice in specialised fields ought to enjoy equivalent protection. Until Parliament acts, however, the law remains as it is. Businesses that operate on the assumption that privilege follows the legal substance of advice, rather than the professional status of the advisor, risk a serious and potentially irreversible loss of protection at precisely the moment it matters most.