Join Date: Dec 2003
Location: Benicia, California, USA
Programs: AA PLT,AS,UA PLAT,PP,J6,FB,EY,LH,SQ,HH Gld,Hyatt Disc,Marriott Plat,IHG Plat
Posts: 11,030
Going between terminals at LHR can be a nightmare. Probably the worst transfer experience I've ever had. Sounds like the OP has decided what to do for this trip, but for future reference I suggest avoiding LHR whenever possible.
Not sure I understood the post about getting good seats on BA 24 hours in advance. Unless the plane is not very full, someone gets stuck with bad seats, so why wouldn't it be the OP?