BMI has just changed direction thats all. With the acquisition of Bmed they managed to get their hands on a lucrative market that was previously well out of their reach. That meant they could get away from the S/H market that is currently being filled with LO CO's slaughtering each other. It may have been a stroke of luck when they got Bmed but they have pretty much got the operation running well now and it is now the core business. L/H, domestics etc are now just additional slot keepers.
We have always known that if they could use the 330's out of LHR on routes where they could put around 40 business class seats then would be out of MAN like march hares. Anyone who joined bmi before L/H went to MAN knows that full well, for those that joined when the operation was up and running it would of been nice for them to have been told.
Having said that the owners of MAN will not want another large carrier pulling L/H routes from their airport and may tempt bmi to stay longer.
It may also be that they do get rid of the 330's all together and keep costs down in readiness for the great Lufty saga that will unfold in due course.