Some late answers.

Sorry for the slow replies work and the real world mucking up my life again!!
Peter, we have not had power on for a very long time, and at open days, a ground power unit roaring away is a real pain for the visitors, so we have installed mains power and some up lighting in the cargo holds to give a bit of light and atmosphere. The cockpit is best left with power off on open days, as you never know what the public will do!! And I don’t necessarily mean the kids!!
We have been tempted to put power on for our own benefit and amusement, but never seem to find the time!!!
Mostleyharmless, it has been talked about on a few occasions, but the step from a collection to a museum is a big one, health and safety would become a nightmare and we would hate to loose that special informal atmosphere that is so special at Bruntingthorpe. Ultimately the decision would rest with the airfield owners, and I believe they have considered it in the past, so who knows!
Don’t forget however that an historic building is going up at Bruntingthorpe, the Lightning Preservation Group’s QRA shelter. This project is inspirational, as are the group behind it, and who knows, it might one day inspire others.