I especially liked the idea regarding the BAA conspiracy to usher people to the duty free shops to spend ££££.
There are only 2 narrow escalators in the centre of T5 to lead you from the check in to gates level, only 1 of which isnt in a shop, and to get to either you have to walk past the other exciting retail opportunities. They wouldnt even let BA have a Club/First security area as it would have diverted them away from the shops.