Contesting a Will in London: Grounds, Deadlines, and What to Expect in 2026

When a loved one dies, a will can bring clarity. Sometimes it does the opposite. A new will may cut out a child. An older will may suddenly reappear. A signature may look wrong. Or a person who was very unwell may have made a major change shortly before death. In London, these disputes can also involve homes, business interests, trusts and assets held in more than one country.

We often see the same starting point: a family member feels that something is not right and wants to know whether the will can be challenged. The answer is not based on fairness alone. A court needs a recognised legal ground and evidence to support it. The sooner the position is assessed, the easier it is to protect the estate while the facts are still available.

This article explains the main grounds for challenging a will in England and Wales, the key time limits, the role of a caveat, the evidence that may matter, and what can happen if the dispute reaches court. It is general information, not a substitute for advice on a particular estate.

Can You Contest a Will in England and Wales?

Yes, but not simply because you think the result is unfair. A will can be challenged if there is a recognised legal problem with its validity or if the estate has failed to make reasonable financial provision for someone who may have a claim under the Inheritance (Provision for Family and Dependants) Act 1975.

That distinction matters. A person can be disappointed by a will and still have no legal claim. On the other hand, a seemingly valid document may be open to challenge if there is evidence of incapacity, undue influence, lack of knowledge and approval, defective execution, fraud or another recognised problem.

The Main Legal Grounds for Challenging a Will

Lack of testamentary capacity

The classic test comes from Banks v Goodfellow and remains important in modern probate disputes. The question is whether the testator understood that they were making a will and its effect, understood the property being dealt with, and could understand the claims of people who might reasonably expect consideration. The test also asks whether a disorder of the mind or delusion affected the decision.

A diagnosis by itself does not prove that a person lacked testamentary capacity. Someone can have dementia or another condition and still have capacity at the relevant time. The evidence needs to focus on the person's understanding when the will was made.

·         Medical records from the period around the will.

·         Evidence from the drafting solicitor or will writer.

·         Statements from carers, relatives, friends or other people who saw the testator.

·         Expert medical evidence where the records raise a genuine question.

Undue influence

Undue influence is more than family pressure, persuasion or an argument. The issue is whether the will was produced by improper influence so that it did not reflect the testator's free decision. These claims can be difficult because the court needs evidence, not just suspicion.

Sudden isolation, dependence on one person, unexplained changes in instructions, or a major benefit to a person closely involved in the testator's care may prompt investigation. None of these facts proves undue influence on its own.

Lack of knowledge and approval

A person may have had testamentary capacity but still not have properly known and approved the contents of the will. This can become important where the document was complex, the testator had serious communication difficulties, could not read it, or the circumstances surrounding its preparation raise a real concern.

The court looks at the circumstances as a whole. Suspicion is not enough, but unusual circumstances can make the evidence around preparation and execution especially important.

Defective execution

Section 9 of the Wills Act 1837, as amended, sets formal requirements for a valid will. In broad terms, the will must be in writing, signed by the testator or by another person in the testator's presence and at their direction, with the signature made or acknowledged in the presence of two witnesses present at the same time. Each witness must then attest and sign, or acknowledge their signature, in the testator's presence.

There is an important point about witnesses. A beneficiary or the spouse or civil partner of a beneficiary can create a problem for the gift to that person, but this does not normally mean that the entire will automatically fails. The exact effect depends on the circumstances and the statutory rules.

Fraud, forgery or dishonest conduct

A forged signature can destroy confidence in a will. So can evidence that a document was altered or that the testator was deliberately misled in a way that affected the testamentary gift. Fraudulent calumny is a specialist example, where false statements about a potential beneficiary are alleged to have caused the testator to exclude that person.

A Clear View of the Main Claims

Possible issue	What must usually be shown	Evidence that may matter
Capacity	The testator did not meet the legal test when making the will.	Medical records, expert opinion, witness evidence, drafting notes.
Undue influence	The will was produced by improper pressure or coercion.	Witness accounts, communications, dependency and conduct evidence.
Knowledge and approval	The testator did not properly understand and approve the document.	Execution evidence, solicitor file, communication evidence.
Execution	The statutory signing and witnessing rules were not met.	Original will, witness evidence, execution records.
Fraud or forgery	The document or decision was affected by dishonest conduct or false execution.	Original documents, handwriting evidence, messages and witness evidence.
Financial provision	A qualifying person did not receive reasonable financial provision.	Relationship evidence, financial need, estate value and contributions.

The Six-Month Rule: Why Timing Matters

One of the most important dates in an estate dispute is the date on which probate is granted. Certain claims under the Inheritance Act 1975 must normally be brought within six months of the grant of representation. That is a real deadline, not a rough suggestion.

The six-month period is especially important for a spouse, civil partner, certain cohabitants, children and other qualifying dependants who say the estate failed to make reasonable financial provision. The court can sometimes allow a late claim, but permission should never be assumed.

Validity challenges are different. There is no single universal limitation period that applies to every challenge to a will. That does not make delay safe. If an estate is distributed, property is sold, money moves overseas or records disappear, recovery can become harder and more expensive.

If probate has not yet been granted

A caveat can be used to pause the grant process while a dispute is investigated. GOV.UK states that a caveat initially lasts for six months and can be extended for another six months. It prevents a grant of probate from being issued while the caveat is in force. A caveat is not, by itself, a final ruling that the will is invalid.

A caveat should therefore be used with care. It can trigger a formal response from the person seeking probate and may lead to legal costs. If you believe a grant is imminent, prompt legal advice is sensible.

What Happens After You Raise a Concern?

Step 1: Preserve the position

The first task is usually to establish where the estate stands. Has probate been granted? Which will is being used? Who are the executors? Have any major assets already been sold or transferred? Those answers shape the next move.

Step 2: Obtain the will and probate information

A probate record can usually be searched through the official service. Once a grant has been issued, the record may provide a copy of the will and grant. The original will is important, particularly where execution or alterations are questioned.

Step 3: Investigate the circumstances

This is where a dispute moves from emotion to evidence. A solicitor may seek the will-drafting file, correspondence, attendance notes and other records. A Larke v Nugus request can be relevant where a professional adviser prepared the disputed will. Medical and care records may also be reviewed where capacity is in issue.

Step 4: Try to resolve the dispute

Many probate disputes do not need a full trial. Negotiation and mediation can give families a private route to settlement. This can be particularly valuable where the parties want to protect relationships, control costs or keep sensitive family details out of open court.

Step 5: Court proceedings if needed

If agreement cannot be reached, contentious probate proceedings may follow. The court can determine whether a will is valid and, depending on the claim, whether the estate should be distributed differently. Evidence is tested carefully, and costs can be substantial.

What Evidence Can Make or Break a Case?

Good probate disputes are built around documents and reliable evidence. A family story may explain why something feels wrong, but the legal case needs proof.

·         The original will and earlier wills.

·         The solicitor's attendance notes and drafting file.

·         Medical, hospital and care records.

·         Letters, emails, texts and other communications.

·         Bank and property records where relevant.

·         Evidence from witnesses who knew the testator at the relevant time.

·         Expert evidence, where the legal issues justify it.

Keep records in their original form where possible. Do not edit messages, remove documents or confront potential witnesses in a way that could affect their evidence. A calm paper trail is often more useful than a heated argument.

London and Cross-Border Estates

London estates can be unusually complex. A deceased person may have a flat in Holborn, shares in a UK company, a family home outside London and a bank account or property overseas. The dispute can then involve more than one legal system.

Foreign documents may need certified copies, notarisation, an Apostille or consular legalisation before they can be used in another jurisdiction. This is where a Notary Central London service can support the document side of a wider legal dispute, while the contentious probate solicitor handles the court claim itself.

For example, an overseas family member may need a power of attorney or sworn declaration authenticated for use in England. In the other direction, a London court or solicitor may need foreign records prepared for use in an overseas process. An Apostille Central London service may form part of that chain, but the correct route depends on the destination authority and the document involved.

Where a Wills and Probate Lawyer London Fits In

A contentious probate matter is not simply a paperwork problem. It is a legal dispute about evidence, procedure, risk and, often, money. A specialist Wills and Probate Lawyer London can assess the ground of challenge, advise on limitation, deal with the executor and other parties, and represent the claimant where court proceedings are required.

Notarial work is different. A notary is not a substitute for a contentious probate solicitor. Where international documents, identity evidence, affidavits or powers of attorney need formal authentication, a notary can provide that specialist service alongside the wider legal team.

How Staple Inn Notaries Can Support Cross-Border Probate Work

We support international families and legal teams where a probate matter has a notarial or document-authentication element. Our role is practical: we help with identity verification, notarisation and the wider Apostille or legalisation chain where required.

·         Notarial authentication for documents intended for use abroad.

·         Certified identity and document checks for international parties.

·         Apostille and embassy legalisation coordination where applicable.

·         Mobile appointments across Central London for time-sensitive documents.

·         Support for families and advisers dealing with overseas assets or foreign authorities.

Our Central London presence is useful for clients working around Holborn, Chancery Lane, Bank, Farringdon and Soho. The main office is at Fox Court, 14 Gray's Inn Road, Holborn, London WC1X 8HN, with additional service points provided by the practice.

For a disputed estate, we recommend separating the jobs clearly. Use a specialist contentious probate solicitor for the challenge itself. Use a qualified notary for the formal authentication work that an overseas authority requires. That division keeps the process cleaner and reduces avoidable delay.

Conclusion: Act Early, Then Build the Case

A disputed will can feel deeply personal. The law, however, asks narrower questions. Was the testator capable of making the decision? Did they understand and approve the document? Was the will properly executed? Was there improper influence or fraud? If the issue is financial provision, does the claimant fall within the statutory class and has the claim been brought in time?

The earlier those questions are tested, the better. A caveat may protect the position before probate. Evidence may be easier to obtain before records disappear. And a well-prepared case can sometimes settle before the family reaches the courtroom.

If your matter has an international element, we can assist with the notarial side of the process from Central London. For the substantive challenge to a will or an Inheritance Act claim, we recommend instructing a specialist contentious probate solicitor.

Questions We Hear Most Often

Can I contest a will because I was left out? Being left out is not enough by itself; you need a recognised legal ground or, if eligible, a claim for reasonable financial provision.

How long do I have to make an Inheritance Act claim? The normal deadline is six months from the date probate is granted, although the court has limited power to permit a late claim.

Can I stop probate while I investigate? If probate has not been granted, a caveat may pause the grant process while the dispute is investigated.

Does dementia automatically make a will invalid? No, the key issue is whether the testator had the required testamentary capacity when the will was made.

Do I need a notary to contest a will? Not usually, but a notary may be needed where overseas documents, identities, declarations or powers of attorney require authentication.