typically I go through LHR to fly BA, but sometimes I travel direct from SNN - the best price I ever got was about ?300ish return with Continental ..... normal best prices are about 350-400 .....
I'm going SNN-LHR-JFK. LHR-JFK is more expensive believe it or not for the same flight!
I think I'll stick with Nov 14-18. I was also looking at mid-October but that's way to early to be thinking of Christmas I think!