Realised I hadn't responded to this thread after my trip....
on the outbound GLA-LHR, it was no problem taking the buggy on board. Pleasant purser said it should be Ok, checked with the Captain and they put it in the cockpit for us.
On the LHR-MIA, again it was no problem, really nice crew (two great ladies in F) took the buggy on board and stowed it for us (not sure where) and made our first trip with an infant on BA really great!

Shame about the return TPA-LGW-GLA flight. We could not take the bugy on board (pretty surly crew to be honest...the CSD told me they had had a heavy night out in Tamp the previous night so werent too sharp !!!) however they did re-check it to LGW for us so we could collect it there and not have to carry our baby around.

As it has been said before, its really down to the crew. Top marks again though to the F crew on the LHR-MIA flight (7th Oct 08 13:40 flight), it was a really great start to the holiday ;-)