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Whenever a party marries, any Will they have made prior to the marriage automatcally becomes revoked (ie it becomes invalid), unless the party has made a special Will "in contemplation of their marriage" (being a Will stating in black and white that the party intends to marry but wishes this Will to remain in place even after his marriage).
On the basis that the Will was not made in contemplation of marriage, his Estate will be distributed in accordance with the strict Rules of Intestacy (ie that he did not leave a Will). As such his Estate would be divided as follows-
The Wife inherits the first £250,000 of the Estate.
If the Estate is worth more than £250,000, after the first £250,000, then whatever is left goes as follows-
I hope this assists and sets out the legal position.