Thanks for that, but I'm happy to say that over the weekend I went to the Central Animal Rescue in Leicester and I've found an absolute sweetheart. She wasn't what I set out to rehome (ie FIV or a disabled) but she has had a rough time of it because her previous owner died and was stray for a while.
Her name is Angel, shes 7 and the most beautiful British Blue. I'm told she has zero desire to go outside so I'm happy. She'll be coming to live with me on 1st November..I'm so excited!
thanks for all your help everyone.