LHC
Its a fantastic idea, given that the prices would be hopefully very low, you would get hordes of passengers from BA and other Long haul airlines, avoid driving to LHR or going UK regional - AMS/CDG/BRU to get cheaper fares.
(a colleague going to Seattle and back paid £3000 less by going BA BRU-LHR-SEA-LHR-BRU rather than LHR-SEA-LHR)
Pilots replys will be tainted by their views on Ryanair and not the idea