If I can just add to that, I think it's important to note that the handover date of the building by Public Works to the House of Commons doesn't mean that's the occupancy date. We need to do a lot of work leading up to the actual occupancy, whether it is a fit-up or a final correction of minor defects and the like. That can take several months, so it's a little premature to say exactly when that final day will be. Hopefully it will be in 2018, as predicted.
On May 28th, 2015. See this statement in context.