She is probably thinking about putting a restriction on the title to stop a sale. In fact, all it will do, if the Land Reg lets her put one on the title, is to ensure you can't complete a sale without her knowledge and consent. If you cannot agree to sell it, and you ought to try, and you want the property sold, you need to see a decent lawyer who can bring a claim for something called an 'order for sale' under section 14 of the trusts and land and appointment of trustees act 1996. Basically, if it is just the 2 of you, the relationship has broken down and the purpose of buying the property was for a home for the both of you as a couple, the court will order a sale. I deal with this sort of stuff when it gets to trial and all I can say is that unless you want to pay lawyers (not a bad thing!) sort it out yourselves… Good luck