You can take steps to protect your property from being fraudulently sold or mortgaged.
You’re more at risk if:-
Your property will be registered if you bought it or mortgaged it since 1998 –check the register if you’re unsure.
You must tell Land Registry if information in the register is incorrect, eg if you change your contact address.
You can track changes to the register or put a restriction on your title if you think you’re at risk by visiting https://www.gov.uk/protect-land-property-from-fraud