Hi there! My signature also varies - i never have the exact same signature....... but ive never had any problems because of this. Now you say that your husbands signature on his passport is different, well the reason for this is probably because when you write your signature for your British passport, you have to sign in a small box - i find it very difficult to write my normal signature in such a small area so the signature , well my slightly ostentatious one anyway.....! has to be really small, this changes the natural flow of your signature! Hope this puts your mind at ease a bit?