Thanks David.
Moving outside, and across the void where the hangar was blown up for the BoB movie, the WW2 Control Tower can be seen on the left, in a heat haze here. The observation/radio room on the roof is a later addition, constructed in the 1980s IIRC.
The Number 4 Hangar, another original building, houses the Battle of Britain items, with many original and interesting exhibits, as well as WW1 and more modern aircraft.
The Bf109E is genuine, and was force landed during the BoB by Horst Perez, of JG26. It's posed as it was photographed at the time, having been faithfully restored, but with the starboard wing left in the original paint.