Dave,
I've often wondered why the 'Grandstand' at LHR is placed where it is, behind two lines of growing trees and the fence! But sometimes its absolutely crowded, despite, as you say, only being about 4 feet above the ground.
I don't know whether you have seen it recently, but there now is a cafe ('Cafe Chi') 100 yards from the grandstand, built in the last 2 months, primarily for the occupants of Word Business Centre buildings, but the 'spotters' can use it if they want.
However, since there are no parking facilities nearby, there is sometimes a problem with parking on double yellow lines.
Last edited by Lukeafb1; 14th Sep 2012 at 06:22.
Reason: Edited to reduce height of grandstand after checking!