RE: spectators areas in the UK airports.

I think it´s great. Theres a nice spectators area on top of terminal two. SO without a zoom one is able to get good shots at the european airlines parking there. One has a nice view to one of the runways but you need a zoom to get good photos. On the other way, there´s a aviation shop, coffee shop and other facilities. Getting off at Hatton Cross (the last tube stop before arriving at LHR) and walking a bit one gets nice photos of the incoming planes.