No demand from LHR...? ? ? Poppycock
The Carribbean routes are seen to be leisure routes with people willing to pay good money to fly up front though, not neccesarily on business. Hence why Barbados and Bermuda have a good First uptake but are both still at Gatwick.
There's a good product and a great team at Gatwick, always in the shadow of Heathrow, but the idea is that to grow the company overall, they can move some routes to Gatwick where BA have dramtically scaled back. The BA Hub concept was closed and now the BA operation is essentially point to point. The "beach fleet" routes mainly aimed at a UK market and so whilst there is feed from GLA/EDI/MAN, they are not so reliant on connecting traffic. Hence if you can maintain these sort of routes succesfully at Gatters and build on them, you get some space to grow Heathrow for routes that need connectivity. Hence why LUX is moving to Heathrow, it's a business destination better suited to the LHR route structure, LGW has mainly leisure.
Last time every heavy route that moved LHR->LGW left the too much of the exisiting connecting traffic flying with the competition back in the Hounslow area....