ere is a question a few down in which the following answer was given:
5. When there is no valid will (which, of course, includes the circumstances where a will has been invalidated through marriage) the laws relating to intestacy apply. They are explained in the flowchart here:
http://www.manchesters.co.uk/Intestacy-flowchart.php
or you can work through this:
https://www.gov.uk/inherits-someone-dies-without-will
6. As you'll see from the above links, the partner of a deceased person has, in the first instance, NO RIGHTS WHATSOEVER to inherit anything from them (unless they were actually married to the deceased person or in a civil partnership with them).
7. Under the provisions of the Inheritance (Provision for Family and Dependants) Act 1975, a person who has lived at the same address as a deceased person, as if they were their spouse, has the right to apply to a court to VARY the terms of their will (OR to vary the intestacy rules) in order to receive 'reasonable financial provision'. So, despite what I've written above, an unmarried partner of a deceased person MIGHT actually be able to receive an inheritance from their deceased partner. However the court procedure is COMPLEX and EXPENSIVE, so it's FAR better to get things properly sorted out before the death occurs.