RE: Heathrow Visitors center.
If I wanna cheap day out at an airport I go to LHR by tube(I work for LT), as Andrew has already mentioned Wimbledon to Earls Court and then piccadily line to LHR , then either spot from Hatton Cross(best when planes landing 27L, not so high)or continue thru’ to T’s 1,2, and 3 for spectators or jump on a bus(free) round to visitors centre(best when planes landing 27R)where the tea and snacks are much cheaper than that overpriced dive on the specs gallery, I very rarely take my car as I resent being ripped off by NCP, Srooge is not my middle name.
mines a largescotch
Dave