Ris, true. Ostlers was RAF with bomb stores and some dispersal. Roughton was also used post Arnhem. Town woods also has foundations along the main path.
When we walked Roughton, on the roadside wood was a lot of asbestos roofing material. In the wilder part nearer the cemetery there were drains and dug outs of some sort. Deeper in we're the 4 brick bunkers I mentioned. Much is covered in dense secondary growth with bracken. That would be a nightmare to search. They are using radar.