I have heard however from a trusty source that BA will be doing some A380 flight training runs through BHX so at least they think BHX is good for something!
I can categorically state that BA are NOT sending the A380 to BHX, neither for training or diversions.
The designated diversion points for BA and the A380 fleet will be LGW/MAN/PIK only. STN may be used if at a push or for a particular type of diversion that STN has been designated for.