Consolidation among UK professional firms has accelerated. Legal practices, accountancy firms, architectural studios, IFA networks and consulting houses increasingly combine, whether through partnership mergers, LLP roll-ups, corporate acquisitions or private-equity-backed platform builds. Every such transaction carries professional indemnity (PI) implications that are easy to underestimate. This entry sets out the framework Apex Insurance Brokers uses when advising firms on the PI aspects of a merger or acquisition.
The legal shape of the deal determines who inherits what. An asset purchase transfers selected assets and, on a chosen basis, selected liabilities — the seller entity remains and typically retains historical liabilities unless expressly novated. A share purchase (or its LLP-membership equivalent) transfers the entity itself, so historical liabilities travel into the buyer's group. An all-in-one combination — two LLPs collapsing into a single successor LLP under the Companies Act 2006 framework and the LLP Regulations — blends features of both and is common where equal partners want a genuine merger. The default under English law is that liability follows the legal person that incurred it; the PI structure has to be designed against that default, not against what the parties assume.
Every professional firm has a tail of work already delivered but not yet time-barred. Under the Limitation Act 1980 a negligence claim can arise up to 15 years after the act complained of. The historical book therefore needs continuous PI cover on a claims-made basis long after the firm itself has ceased new work. Three options recur. Run-off cover continued by the acquired firm's insurer, funded at completion or across the run-off period. Extension of the acquirer's PI to include the acquired firm's historical work, expressly named and priced. A hybrid where the run-off carrier holds the historical layer and the acquirer's insurer holds current-year business.
Solicitors in England and Wales must notify the SRA under the SRA Standards and Regulations 2019 in respect of change-of-ownership, successor-practice and cessation events, and any tail cover must comply with the SRA Minimum Terms and Conditions and the six-year run-off requirement. Chartered accountants notify the ICAEW under the firm-authorisation regime. Architects notify the ARB under the Architects Act 1997. IFAs and other FCA-authorised firms notify the FCA under the change-in-control provisions of Part XII FSMA 2000. The regulator's notification and the insurer's notification are not the same event.
Where the acquired firm's insurance is being closed down, run-off cover responds to claims made in later years for work performed before the merger date. For solicitors this is mandated for a minimum of six years under the SRA MTC. For accountants and architects it is a matter of contract and prudence, though ICAEW guidance treats it as expected. The premium is usually a multiple of the last active-year premium.
Warranty and indemnity (W&I) insurance is a separate product covering the buyer against breaches of warranties given in the sale and purchase agreement. Typical W&I policy provisions exclude known matters disclosed in the data room, apply a de minimis and retention, and run for the warranty period stipulated in the SPA — usually two years for general warranties and up to seven for tax and title. W&I is not a substitute for PI. A W&I insurer will not respond to a professional-negligence claim by a client of the acquired firm; it responds to a breach-of-warranty claim by the buyer against the seller.
Apex Insurance Brokers coordinates the PI restructure alongside the corporate lawyers running the deal — early engagement with the incumbent insurers, a structured disclosure exercise that satisfies the duty of fair presentation under section 3 of the Insurance Act 2015, quotations for run-off and extension, and drafting of the PI provisions in the merger agreement. The most frequent pitfall is the assumption that the acquirer's PI automatically extends backwards to cover the acquired firm's historical work. It does not. Related errors include leaving run-off unfunded until after completion, under-disclosing the acquired firm's claims history at combined renewal, and treating W&I as if it replaced PI.
Two five-partner solicitors' firms merge into a single successor LLP in 2026. The parties assume the acquiring firm's PI will extend to cover the acquired firm's historical work. In reality the acquirer's PI covers work performed from the merger date. The acquired firm's historical book needs one of three structures: (a) the acquired firm's PI continues in run-off for at least the six-year SRA MTC period, funded at completion; (b) the acquirer's PI is expressly extended to include the acquired firm's historical work, usually at additional premium and following full disclosure under section 3 of the Insurance Act 2015; or (c) a hybrid, with run-off holding pre-merger claims and the fresh policy holding post-merger work. The broker coordinates the placement, obtains the quotations, ensures SRA notification is filed, and documents the chosen structure in the merger agreement.
See the profession-specific pillars: solicitors PI, accountants PI, architects PI, IFAs PI, management consultants PI and surveyors PI. For the companion topic see succession planning and PI.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority. Firm reference number 724952. This entry is general information, not advice on any particular policy.