Hi - yes you can put a charge against the property - I'm in the same situation myself & you can either do it yourself or get a solictor to do it for you. Ring you local solicitor & ask if they do 0.5hours of free legal advise - most do & explain the situation to them. As you have proof of payment you def have a case. Have a look on
www.Landregistry.gov.uk and they will even send you the forms for you to fill in. Good luck & hope you get it sorted! My ex is trying to have the house repossessed that I have got a charge against so he doesn't have to pay me - it's all good fun isn't it!!