It's a bit of both. The spares have been recently used for a change out, so the ones the OEM have need to be completed. Then you have to get our good friends MA down to sign the work off, then the crew together - some who are about to have a hard earned holiday. Then you also have to ensure there is room between the 20,000 cars at Bruntingthorpe to land.
So the aircraft will sit outside at FB for the time being.
The aircraft is still shaking down after it's rebuild, hopefully in 2009 it will get more action.