If he spends a year there he will get so much practise on shot stopping, 1 on 1s, distribution because lets face it. Birmingham won't be keeping possesion for long periods of time, the fans and players will also be very understanding of his mistakes. He could really excel there, join up with the England squad and probably be England's number 2. Then hopefully he could get another season or two on loan then come back.
His future is bright if he stays strong.