- Make a new will. A standard clause in a will says 'I revoke all previous wills'.
- Destroy the will or write cancelled on it. You need to have the original for this. The destruction must clearly be with the intention of revoking the will, not just accidental.
- you can direct someone else to destroy the will but it must be done in your presence. It is not sufficient to ring your solicitor and tell him to destroy it.
- by some writing (ie. a letter) that is signed in the same manner as a will (with 2 witnesses etc).
- You can't authorise someone else to revoke a will after your death.