Big earners like MAN, BHX and STN (maybe EDI) will attract the new aircraft first
From what we have been told, next year will see the new aeroplanes in exactly these bases. I know nothing of the supposed "big earners", however there is a strategy behind ring fencing the new aeroplanes to certain bases at first, that is the requirement of different sets of spares, by putting the aeroplanes in just the 3 locations, there is no requirement to have more spares in the system at other bases.