https://propertyalert.landregistry.gov.uk/
Land Registry records have a sort of poor man's locking. The buyers (or in practice their solicitor) need to first perform a "Search" which would get recorded as activity, some time before they can file paperwork to claim it was sold, and so that gives you considerable time to say "Hey, I'm not selling this, why is there a Search by Honest But Incompetent Solicitors LLC?" and phone up to yell at somebody.