Igor, the Sunderland and Lancaster, along with the Vulcan and many of the other larger exhibits, are in what was known as the 'Superhangar', built specially for the Museum, at the edge of the field, and opened in the late 1980's. Since then, many of the larger aircraft which had been parked outside, have been moved, and a newer structure, at the opposite end of the field, is now the purpose-built 'American Museum in England', which is dedicated to the USAAF and USAF prescence in the UK since WW2. This impressive building houses the collection of US aircraft, including the B52, B17G and B24J. It is partly covered in grass, looking like a bunker of sorts, and the curving approach path is lined with tall, glass monoliths, each engraved with row upon row of P51's. P57's, B17's etc, representing every aircraft lost, from the US Air Forces based in England, during WW2 - it's a very long row of monoliths!
In between these buildings are the original airfield hangars (including an empty base, where one hangar was blown up for the BoB movie), inside which the rest of the collections are housed, including the airworthy aircraft which can be seen flying, and the restoration departments.
Roman, it was difficult to photograph the HeIII (ex- Spanish Air Force CASA I-III) due to the restricted space in front of the aircraft. At the time of my previous visit, about 5 years ago, this Heinkel was in pieces on the ground, in a corner of the hangar, but it is now up on it's 'legs', and appears to be progressing slowly. I'm not sure, but it could have been one of those used in the BoB movie of 1968, although it hasn't been in the UK all of the time since then. Unfortunately, there wasn't anyone around to ask about its history or current status.
Here's a couple of the detail shots I managed to get.