Solved. The flight to London from Newcastle has been re-timed.
Why do they not send you an e-mail? It would make life a lot simpler. I used to fly with Lufthansa and an e-mail was sent fro each time change.
Sometimes BA does this. A LAN booking I made late last year has had at least 8 of these.
For some inexplicable reason, other bookings do not receive the same treatment.