I'd agree with you Seasider if I lived on the east coast but I don't, I'm on the Pennines so for me although I hate to admit it MAN is handyI am in agreement with Michael, forget LHR, try IST and either FRA/CDG for connections.
I don't agree with his suggestion of using MAN. For any one on the East Coast, the drive is horrendous and the less said about TPE, the better.