Thank you for the thought but yes, it is in P. It's definitely a problem between the key and the ignition. WD40 works sometimes, so perhaps both the key AND the ignition are worn (my car is, after all, 18 years old). My partner has just tried to lock the car with the spare key while the best one is in the ignition; it won't! (So I guess I've got my answer. Now, I suppose, I'll just have to bite the bullet and buy a solution...)Stupid question (from me!) - are you sure the transmission is in P, as if it's not you can't get the key out!