I believe there is an oral AST, albeit at a price fixed by mortgage payments - which may or may not be below market value. Many .
Just visit landlordzone and post the following.
"Hi. I own a house, and my partner owns a flat. A few years ago I moved in with my partner in her flat and let an elderly relative move in to my house. The agreement was that they could live there and would just cover my costs, paying the bills and my mortgage payments. I now want to move back in and have asked them to leave tomorrow. However they are refusing to leave as they say that I have to go through the courts to evict them as they've got an oral AST. This isn't fair as I've let it to them cheaply as I feel sorry for them. Can I just go in and change the locks whilst they are out?"
References to the abolition of dependent relative relief are surely not relevant. This is 223(4) relief which is available under a wholly different set of circumstances, and requires only that the place be let.
It would be helpful to see some guidance supporting the following point of view which appears to fly in the face of the legislation.
This was all locked out when they closed off Dependant Relatives CGT exemption, even if the paid you a £ a week LR was not available.