Assuming that the worst case conspiracy theorists could be right, and I hope they aren't, are BA able to move all og Gatwick long haul to Heathrow.
I thought some US routes HAD to fly from Gatwick and this was the reason that ahigh yield oil route like Houston had to operate from here.
The routes involved are southern US and Carribbean :
Atlanta, GA
Dallas, TX
Houston, TX
Orlando, Fl
Tampa, Fl
Bermuda, Barbados, Antigua, St Lucia, Grenada, Tobago and Kington.
Also thought this was why American had to fly their Dallas services from Gatwick when it would make sense to consolidate at all London ops at Heathrow.