It seems like every county has it's own name for them. It's a "cob" where I'm from. If I've missed any, tell me. I am a closet cob freak!!!! What do you call them with chips in them aswell? Unsuprisingly, it's a chip cob round here!
Bread roll as far as I know, but go to Finchley{arsenal} or somewhere or Kings Road{chelsea) (not far from me in all honesty) it would probably be Bap(said in a posh accent), TBH it wouldnt even surprise me if they called it soemthing French or whatever. F.ucking Toffs eh!!