'A Touch of Frost', ITV last night.

I was fiddling about with the channel button at about 11:00 last night and came across the end of this programme which featured a kid and his mother being pursued by a gunman around an airfield in the dark, looked like a Canberra parked up next to the action.
Ah ha wheres this I thought, nicely cut grass and inside some kind of museum building full of turrets.
Into a hangar full of aircraft, how long will it take me to work this one out.
Blue Hunter, JP, Mystere? whats that, a Mosquito! Then a Bf109, where the hell is this. Then the large 4 engined bomber gave it away, I was surprised to see a production being filmed in a museum so far from London.
Did anybody see it, though I gather it was originally shown in 2005, any guesses, though probably not hard without even seeing the programme.
It would have been a good advert for the museum though if the place had been mentioned in the credits at the end, pity it wasn’t.