How to Challenge a Will for Lack of Knowledge and Approval

A will may be legally valid in formal terms-signed correctly with two witnesses present-yet still fail to reflect the real intentions of the person who made it if the testator did not know and approve its contents. Challenging a will on the basis of lack of knowledge and approval is a recognised ground in English law for arguing that a will is invalid, separate from mental capacity or undue influence. This article explains the legal basis for such challenges in England and Wales, when they might arise, what evidence is needed, how the process works, key time limits, and practical considerations for those concerned that a will does not truly represent the testator's intentions.

What Does “Lack of Knowledge and Approval” Mean?

For a will to be valid, the person making it (the testator) must:

• Understand that they are making a will;
• Know what is in the will (its contents); and
• Approve those contents before signing.

This requirement is distinct from the testator's mental capacity in general, although the two concepts may intersect. A person can have the requisite mental capacity but still fail to know or approve the terms of the document they have signed. A valid will requires both elements.

There is a presumption that a duly executed will was known and approved by the testator. However, where the circumstances surrounding the will's execution are suspicious or the testator had communication or physical impairments, that presumption can be rebutted and must be proven with evidence.

When Might Lack of Knowledge and Approval Arise?

A challenge on this ground may arise in several different factual scenarios:

Testator Could Not Understand the Document

If the testator was blind, illiterate, deaf or otherwise unable to read or hear the contents of the will and it was not read over to them in a way they could follow (for example with translation or sign support), a court may question whether they truly knew what they were signing.

The Will Was Signed on Behalf of the Testator

Where someone other than the testator physically signs the will on their behalf (for instance because of disability), the presumption of knowledge and approval does not automatically apply. The court may require specific evidence that the testator was fully aware of and agreed to the terms prior to signing.

Suspicious Circumstances

Examples that may excite the suspicion of the court include:

• A beneficiary played a significant role in preparing or arranging the will.
• The will represents a sudden or unexplained departure from previous wills.
• Spelling errors or unusual language when the testator customarily understood legal terms.
• A beneficiary who arranged the will also witnesses it or is closely involved in execution.
• The testator had significant impairment (e.g. sight or hearing) that could have prevented them understanding the terms.

Circumstances like these do not automatically prove lack of knowledge, but they can shift the evidential burden and require the person seeking to uphold the will to demonstrate that the testator knew and approved the document.

Key Legal Principles

Presumption and Rebuttal

Once a will is correctly executed and there is no evidence to raise doubt, the law presumes that the testator knew and approved its contents. This means that a challenger must produce evidence to rebut that presumption before the court will consider the merits of the claim.

Distinction from Testamentary Capacity

Knowledge and approval focuses specifically on whether the testator understood and accepted the will's content. It is not synonymous with testamentary capacity, which assesses whether the testator generally had the mental ability to make a will. A person can have the general capacity to make a will yet lack specific knowledge of its terms if, for example, they were misled or did not have the opportunity to read or hear it.

How to Challenge a Will on This Ground

Step 1: Seek Expert Legal Assessment

A solicitor experienced in contentious probate should assess whether a lack of knowledge and approval claim is viable, as these cases can be fact‑intensive and evidence‑driven.

Step 2: Gather Evidence

Evidence is crucial. Useful material may include:

• Records or testimony from the drafting solicitor about the meeting and any reading or explanations given.
• Witness statements from those present when the will was explained or signed.
• Medical or care records indicating sensory or communication impairments.
• Copies of earlier wills to show inconsistency without plausible explanation.

Step 3: Raise a Caveat (if Probate Not Yet Granted)

If the estate has not yet been administered and probate has not been granted, lodging a caveat with the Probate Registry can pause the grant and protect your ability to challenge the will. This prevents assets from being distributed while the issue is prepared.

Step 4: Issue Court Proceedings

A claim challenging the will can be issued in the High Court (Chancery Division) setting out the factual basis for alleging lack of knowledge and approval and the evidence supporting it.

Step 5: Disclosure and Hearing

Both sides will exchange documents. A judge will consider the evidence and decide whether the presumption of knowledge and approval has been rebutted and, if so, whether the will is invalid on this ground.

Possible Outcomes

If the court finds that the testator did not know and approve the contents of the will:

• The will may be declared invalid in whole or in part.
• An earlier valid will may be reinstated and admitted to probate instead.
• If no valid earlier will exists, the estate will be distributed under the intestacy rules.

The precise outcome will depend on the evidence and the individual circumstances of the case.

Time Limits and Practical Considerations

Acting Promptly

There is no specific statutory deadline for this type of challenge, but you are generally expected to act within a reasonable period after learning of the will and before probate is finally administered. Delays can make evidence harder to gather and weaken the case.

Risks and Costs

Challenging a will on this ground can be expensive and emotionally challenging, particularly where family relationships are strained. If the claim fails, you may be responsible for your own legal costs and potentially some of the costs of others involved.

Common Questions

Is lack of knowledge and approval the same as lack of capacity?
No. A person can have general testamentary capacity yet still lack specific knowledge of the will's contents at signing. The two concepts are related but legally distinct.

Does the will have to be totally void to succeed on this ground?
If parts of the will were known and approved but other parts were not, the court may admit the parts known and approved and refuse the rest, depending on the evidence.

Can suspicious circumstances alone invalidate a will?
Suspicious circumstances do not automatically invalidate a will. They can, however, remove the presumption of knowledge and approval and require positive evidence from those defending the will to show the testator knew and approved its contents.

Key Takeaways

A challenge to a will for lack of knowledge and approval focuses on whether the testator genuinely understood and accepted the contents of the document they signed at the time of execution. While the law presumes such knowledge if the will was correctly executed, this presumption can be rebutted by evidence showing that the testator was unable to know or approve the terms due to physical limitations, communication barriers, or suspicious circumstances around the will's creation. Successful challenges can lead to invalidation of the will or reinstatement of earlier valid wills, but they require clear evidence and prompt action. Seeking specialist legal guidance early significantly improves the prospects of a well‑prepared case.