@ CornishFlyer
It didn't do its job properly and I've updated my posting to reflect that inaccuracy in my posting.
Now that it does do its job properly, why is everyone saying it's so marvellous just because it works as per specs? Do we write to customer services to say how wonderful it is that our flight got us from A to B without crashing, arrived on time, and the cabin crew were friendly and did their jobs very well?
I am being a bit facetious here. I have been to T5, both andside and airside, I haven't flown to or from it. Architecturally it's impressive but I understand from a friend of mine who commutes between LHR and JNB using T5 that it's not particularly efficient, and often overcrowded and understaffed. He admits that it's a huge improvement over any other terminal at LHR.