I think you will find that the drop in pax was mainly due to weather and the planned strike by BA ( which I know didn`t happen) but by then most people had either cancelled trips to London or onwards or made alternative arrangements, hence the reason the domestic pax are down 7% or so
So I don`t think it is all gloom and doom
Ian
PS when BA cancelles all flights to Heathrow for a day you take a big hit strait away