What makes a will invalid in the UK?

A will can be declared invalid if it fails to meet UK legal requirements. Key factors include: the will must be in writing, signed by the testator (the person making the will), and witnessed by two independent adults not named as beneficiaries. A will signed under duress, or with fraudulent or undue influence, can also be invalid. Mistakes such as missing signatures or improper witnessing commonly cause wills to be rejected during probate.