Learned about this to protect against rare cases of fraud leading to owners losing their home. But also relevant to anyone in a dodgy relationship / just wanting to protect vulnerable loved ones. You can sign up with the Land Registry for free email alerts if any queries are raised about up to 10 properties. You don't have to own the property, so eg if potential buyers are asking questions / owner is looking to change ownership status etc you will get an alert. I've just signed up for my and my elderly parents property. It only took minutes here:
propertyalert.landregistry.gov.uk/