good question but I think this is how you are going to be nailed, you just need an id for traveling internally, you don't need your AP.
but if you don't have driving license then you need an ID, so to show a British Passport, then you might get a way with it or you might be question about visa and all that and you will be nailed. so it is not about the AP and traveling internally.
GeneralG, Where are you from originally and what exactly are you saying here?