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Disclosure in Business Acquisitions UK: Buyer Guide

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Written by Brad Askew Solicitor (non-practising)
Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice.
Updated June 2026 · England & Wales
When one business buys another, the information gap between the two sides is usually enormous. The seller has lived with the company for years and knows where every skeleton is buried. The buyer, no matter how much due diligence they run, is working from the outside in. Disclosure is the process that bridges that gap. It sets out what the seller is telling the buyer about the target, and it shapes who carries the risk if something turns out to be different from what was promised. This guide walks through how disclosure works in UK share and asset purchases, what a disclosure letter actually does, how it interacts with warranties in the sale agreement, and the practical steps buyers and sellers should think about before signing. If you are weighing up an acquisition or preparing to sell, understanding this process can save you a great deal of money and grief later on.

Overview

Disclosure, in the context of a UK business acquisition, is the formal process by which the seller tells the buyer about the true state of the target company before the deal completes. It covers things like the company's finances, its contracts, its employees, its property, any ongoing disputes, tax positions, intellectual property, and any regulatory issues.

The point is twofold. First, it lets the buyer form a realistic view of what they are buying. Second, it allocates risk. Warranties in a sale and purchase agreement (SPA) are contractual promises by the seller about the state of the business.

If something the seller has disclosed turns out to cause loss, the buyer generally cannot claim for breach of that warranty, because the issue was flagged. Anything not disclosed, however, remains the seller's risk. This is why disclosure sits at the heart of every well-run acquisition and why it is negotiated so carefully on both sides.

Key steps

  1. Early preparation and heads of terms. Before formal disclosure begins, the parties usually agree heads of terms setting out price, structure, and key conditions. The seller should start pulling together records on finances, contracts, staff, and assets early on, because rushed disclosure tends to produce gaps that surface as disputes after completion.
  2. Due diligence by the buyer. The buyer's legal, financial, and commercial advisers send detailed questionnaires covering every area of the target. The seller populates a data room with supporting documents. This phase is where most of the real information changes hands, and it directly shapes what ends up in the warranties and the disclosure letter.
  3. Drafting the disclosure letter. The seller's solicitors prepare a disclosure letter that responds to the warranties in the SPA. It typically contains general disclosures (for example, anything on public registers) and specific disclosures (particular issues attached to particular warranties). The aim is to carve out known issues from the seller's liability.
  4. Negotiating disclosures and warranty scope. The buyer will push back on vague or overly broad disclosures, because anything properly disclosed reduces what they can claim for later. Expect several rounds of redrafting. Materiality thresholds, knowledge qualifiers, and time limits on claims are usually negotiated alongside the disclosure content.
  5. Exchange, completion and post-completion. The final disclosure letter is signed and dated at exchange, and often a bring-down or supplemental disclosure is given at completion if there is a gap between the two. After completion, the buyer keeps the disclosure bundle carefully, since it is the reference point for any future warranty claim.

Common questions

If you're dealing with this kind of situation, a call with an experienced legal adviser can help you work out the right next step — from £89.

Common questions

Q Is there a general legal duty on sellers to disclose everything about the target?
Not in the way many buyers assume. Under English contract law, there is no broad duty of good faith requiring a seller to volunteer every piece of information. The real protection comes from the warranties and indemnities in the sale agreement, and from the buyer's own due diligence. That is why disclosure is handled as a structured, contractual process rather than left to general legal principles.
Q What is the difference between a warranty and a disclosure?
A warranty is a contractual statement by the seller that something is true about the business, for example that there is no ongoing litigation. A disclosure is the seller qualifying that statement by flagging exceptions, for example noting a specific dispute with a supplier. If an issue is properly disclosed, the buyer generally cannot bring a warranty claim for it. If it is not disclosed, they usually can.
Q What is a disclosure letter and who prepares it?
The disclosure letter is a formal document from the seller to the buyer, usually drafted by the seller's solicitors and delivered alongside the SPA. It lists general matters that are treated as disclosed (such as public register entries) and specific matters tied to individual warranties. It is often accompanied by a bundle of supporting documents that forms part of the disclosure.
Q What counts as a proper disclosure?
A disclosure generally needs to be fair and sufficiently detailed to allow the buyer to understand the nature and scope of the issue. Simply dumping thousands of documents into a data room and saying 'everything is disclosed' is usually not enough. The SPA will often define the standard of disclosure required, and buyers should push for clear language so vague disclosures cannot be used to block later claims.
Q Does disclosure work the same way in share sales and asset sales?
The core idea is the same, but the detail differs. In a share sale the buyer takes on the whole company, including historic liabilities, so disclosure tends to be broader and more forensic. In an asset sale, only specified assets and liabilities transfer, so disclosure focuses on those assets, key contracts, and employees who will move across under TUPE.
Q What happens if the seller fails to disclose something important?
The buyer may have a claim for breach of warranty, and in serious cases potentially for misrepresentation. Remedies typically include damages, and occasionally rescission of the contract, although rescission is rare once completion has happened. The SPA will usually set financial caps, time limits, and notification requirements for claims, which is why the wording of those clauses matters so much.
Q Can warranty and indemnity insurance replace proper disclosure?
No, and insurers will not let it. W and I insurance sits on top of the SPA and covers unknown breaches of warranty. Anything that has been disclosed, or that should have been picked up in due diligence, is typically excluded. Insurers expect to see a properly run disclosure and diligence process before they will write the policy, so it complements rather than replaces disclosure.
If you're dealing with this kind of situation, a call with an experienced legal adviser can help you work out the right next step — from £89.

Sources

This guide is based on primary UK law and official guidance.

Brad Askew, Solicitor (non-practising)

Written & reviewed by

Brad Askew Solicitor (non-practising)

Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice. LegalDocuments.co.uk is not a law firm and does not provide regulated legal advice.

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Legal disclaimer
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.