Beware of Post-Execution Changes to Legal Documents: Lessons from Boult v Together Personal Finance Ltd [2026]
When legal documents have been signed and completed, it can be tempting to view small amendments as administrative housekeeping. However, a recent High Court decision highlights just how serious the consequences can be when changes are made to a deed without the consent of all parties involved.
The case of Boult v Together Personal Finance Ltd [2026] EWHC 809 (Ch) serves as an important reminder that unauthorised alterations to an executed deed can render the entire document void, with potentially devastating consequences for lenders and other parties relying on that document.
The Legal Principle
The legal principle originates from Pigot’s Case (1614), a longstanding rule of English law which provides that if a deed is materially altered after it has been executed, without the consent of the party bound by it, the document may be rendered void.
For the rule to apply, the alteration must be:
- Deliberate – the change must be intentional rather than accidental; and
- Material – the change must affect the parties’ rights or obligations or have the potential to prejudice a party’s legal position.
The courts assess materiality based on the potential impact of the alteration at the time it was made, not by looking at what subsequently happened. A party cannot avoid the consequences of an unauthorised amendment simply because the issue was later corrected or because no actual loss ultimately occurred.
What Happened in Boult v Together Personal Finance Ltd?
Ms Boult obtained a short-term bridging loan from Together Personal Finance Limited (“TPL”) to refinance existing borrowing.
The loan was intended to be secured by a legal charge over her residential property only. Ms Boult also owned an adjoining parcel of land, which was expressly excluded from the security arrangement.
Following execution of the legal charge, TPL’s solicitors inserted the title number of the neighbouring land into the charge document by hand. This amendment was made without Ms Boult’s knowledge or consent, and the revised charge was subsequently registered against both titles at HM Land Registry.
Although the lender later removed the charge from the neighbouring land, a dispute arose when Ms Boult failed to repay the loan. In defending possession proceedings, she argued that the post-execution amendment rendered the entire legal charge void under the rule in Pigot’s Case.
The Court’s Decision
The High Court agreed with Ms Boult.
The court held that the addition of the neighbouring land was both deliberate and material. It expanded the scope of the lender’s security and therefore affected the legal rights and obligations created by the deed.
Importantly, it did not matter that the lender’s solicitors believed they were correcting an error or acting in good faith. Nor was any fraud or dishonesty required. The key point was that a conscious alteration had been made to an executed deed without the consent of the affected party.
As a result, the legal charge was declared void in its entirety, not merely in relation to the additional land. The lender lost all security, including over the residential property that had originally and properly been intended to secure the loan.
The court did, however, confirm that Ms Boult remained personally liable for repayment of the underlying debt.
Key Lessons for Lenders and Borrowers
This decision provides several important practical lessons:
- Do Not Amend Executed Deeds Without Consent
Any post-execution change to a deed should only be made with the express agreement of all relevant parties. Even well-intentioned amendments can have serious legal consequences.
- Later Corrections May Not Save the Document
Once a material and unauthorised alteration has been made, the deed may become void immediately. Attempting to correct the error afterwards may not restore its validity.
- Security Can Be Lost Entirely
Perhaps the most striking aspect of the decision is that the lender lost all of its security, including security over property that had always been intended to form part of the transaction. The lender was left as an unsecured creditor.
Wider Implications for Finance Transactions
Although the facts of Boult were unusual, the case highlights broader risks when amending finance documentation.
Even where all parties agree to changes, care should be taken because amendments may:
- Create new security interests that require registration at Companies House;
- Affect existing guarantee and security arrangements and their enforceability;
- Create opportunities for challenges by insolvency practitioners or other creditors.
Where errors are discovered after completion, the safest course is often to enter into a formal deed of rectification or, in some cases, execute replacement documents rather than attempting informal amendments.
Conclusion
The decision in Boult v Together Personal Finance Ltd demonstrates that seemingly minor changes to executed legal documents can have major consequences. The courts continue to take a strict approach to unauthorised alterations, particularly where the effect is to change the scope of a party’s rights or obligations.
Whether you are a lender, borrower, guarantor or business owner, it is essential to obtain legal advice before making amendments to completed finance documents. Taking the correct approach at the outset could avoid costly disputes and protect the enforceability of your security.
If you require advice on legal charges, finance documents, security arrangements or deed rectification, our commercial property and banking team would be pleased to assist.
If you would like any more information relating to this article please contact Gavin Lampert on 020 8221 8062 or at gavin.lampert@bowlinglaw.co.uk
This is not legal advice; it is intended to provide information of general interest about current legal issues.
