If you have not properly provided for any of your dependants who are unable to maintain themselves, or if you have not been fair to your spouse (or an ex-spouse who has not remarried), then under an act of law called the Inheritance (Provision for Family & Dependents) Act 1975 the Court can alter your Will. Any reasons for leaving someone out should, therefore, be given in a separate letter of wishes. The Court will then consider these reasons although it will not be bound by them.