You need to apply to get probate. Before applying, you must check: that probate is needed that you’re eligible to apply whether there’s Inheritance Tax to pay You can check if probate has already been issued by searching the probate records .
Requirements
If your right to live in the UK depends on your relationship with someone who died you might need to apply for a new visa. Check the rules if: you're in the UK as the partner of a British Citizen or someone with indefinite leave to remain your partner who died served as a member of HM Forces Contact UKVI to check the rules for other visas