Both Companies have culpability, but for different aspects.
But you are right Irish, The BAA have been very quiet.
It is BAA's terminal, the building, its infrastructure: lifts, toilets, announcement system, flight information screens, & critically, the baggage system, are ALL the responsibility of BAA. The fact that many of these items were not complete (& still arent, & many wont even be ready in June after the delayed switch!!), is completely the fault of BAA as is the disruption associated with these.
BAA were also responsible for the staff carparking- not having kicked the builders out of the car park for operational staff, & getting the bussing wrong. They also failed to provide enough staff to man security points, meaning an hour for BA staff to get through and report for work.
Builder refers to testing before moving in & BA's responsibility. To some extent this is true, there must have been failings in the testing not to have picked up the problems staff were going to have finding their way around the place and knowing what to do. However the period of operational readiness (testing and getting ready and familiarising staff), that BA were given was SUPPOSED to be a completely finished building with all systems and infrastructure in place and no construction, by MID SEPTEMBER. As we know building work still hasnt finished, & in essence it wasnt safe to get passengers and staff in to test properly till Dec. A large number of trials had to be cancelled or de-scaled.
More-see part2!