Peacekeeper,
It is a good idea to take a packed lunch, there is a canteen next door at Cranebank but you will not have access to it. On our day one of the interviewers did offer to buy sandwiches for anyone who wanted them but by the time they get back lunch is over. Only vending machines on site only do the standard crisps and chocolate bar type things so I would take along at least a sandwich.
AngryBlackMan,
In the past few weeks alone I have flown with female captains, black captains, asian captains and even a few white captains!! I don't think BA could be accused of discrimination in this way.