The collapsed buildings are the remains of old chicken sheds. There were three of these baterries, two near Lodge Lane which is shown in your pictures. The other one over that side was situated where the new business park - the black wooden shuttered sort of buildings are. The sheds were kept apart in case disease occurred. The third shed still exists and is in a similar neglected state - though not quite as collapsed in on itself as the Lodge lane one. This is located over by Langham Lane near the museum site. This chicken shed was built on the base of the old T2 hangar. There is a lot of concrete in the ground over that area which is why the land is not used for farming. A lot of roadways I beleive.
The site of the museum was built on a fuel storage area, with Old House Lane being fairly close by the other items in your picture could have something to do with fuel operations although I am only guessing.
At the site of the chicken shed near the museum there was a lot of .50 calibre cartridges in the ground close by and a 1930's penny right behind it when I did some metal detecting some years ago. Along the peri track towards the museum there was also a lot of .50 cartridges and also pistol cartridges that I found.