See they're about to start on a resurvey of all the sites in the Defence of Britain database.
Idea is to revisit as many sites as possible and report on any damage/environmental change, as many of these sites were originally surveyed in the early '90s (some as far back as the '70s privately).
Can think of at least one which the owner was threatening to demolish as I looked at it...think I managed to scare him enough with tales of all the "asbestos" in the roofs to put him off though

Not that far from the truth, actually. My old man was a GPO Telephone Engineer, and until the early '70s was based in an old Bevan Boy camp. When they moved to a purpose built place, it took TWENTY years to demolish the old camp due to the amount of asbestos on site. It's now a college.
Just as a complete aside, do any of the British members of the forum have an INTACT barrage balloon site near them? I've seen the remnants of quite a few, I just wondered if one had managed to miraculously survive...
Regards,
Gordon