I can't understand why BA/BAA didn't do simple things like move all the baggage handlers' car parking spaces LAST week or LAST month and bus them back to T1/T3/T4 for a couple of weeks. That way all of those silly parking problems would have been dealt with already. It's an absolute no-brainer with a big project that MUST go well on day one even if it falls apart on day two by which time the media have all gone home, you should do EVERYTHING you can possibly do in advance, in advance. What's the cost of a few buses to move people back to their old workplace for a few weeks?
And take a leaf out of Eurostar's book - don't leave the move of vital equipment until the night before. Eurostar moved all their x-ray stuff or fitted new stuff at St Pancras ages before the move of service, and put hired or retirable equipment in Waterloo to keep it going for it's last few weeks. This new terminal cost £4.3bn, why didn't they keep a few mere million back for equipment hires to back-fill T4 so that they could take their time fitting T5 out properly? In fact even if T4 had been left short resulting in chaos there for the last few weeks, if it had allowed T5 to open properly fitted out instead of rushed and understaffed, the overnight improvement would have been fantastic publicity.
Still waiting for resignations from BA executive management, I guess we are not going to get them
