BA won't let GB expand much more out of LGW due to Scope (Union) agreements and slots are getting harder to get hold of along with stiff competition. However they are able to expand out of MAN. I am told that any further expansion for GB will be out of MAN for the next couple of years then evaluate another "Northern" base. So who knows, GB admit it's hard work competition wise in Spain and Portugal and need to look further afield.
The A330 may only be a rumour but one that should not be discounted in the near future.