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If you execute a new Will with a different residuary beneficiary then you are not under any legal obligation to inform the previous beneficiary under the old of the change. It is your prerogative whether to inform or not.
In the case of a Will executed validly without any fraud or undue influence, a person would only be able to make a claim against the deceased's estate under the Inheritance (Provision for Family and Dependent) Act 1976. In order to do this the person must make an application to Court within 6 months of the date of the grant of probate and prove that they were to an extent financially dependent upon the deceased within their lifetime. The Court would then consider what would be a reasonable financial provision to make for them out of the deceased's estate.
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