Im sure they do complain on £800 pm, either that or they live with their parents in the SE (not London)!!!!! Besides who in the office earns that? I've worked in many dept and never come accross anyone who earns that ( except school leavers.)
Back to the bus........
The bus does NOT guarantee arrival on time at work. It runs to its own timetable and if you are delayed, then there is no bus. If you are called out and one has just left, then its a late form for you. Your contract says "2 hrs from LHR" there is no mention of a bus to bail you out. This perk still remains because we fly out of both airports and are only allowed to park at one; not to mention that us old timers had our contracts switched from LGW to LHR many moons ago.