panshanger
There have been many times when panshanger has been under threat, one option still brought up frequently is gravel extraction. I'm not aware of any immediate threat but when the lease runs out, it will no doubt raise its head again.
I believe the reason the T2 type hangar is not used is due to local planning restrictions, and the overhead join is I think to mitigate noise disturbance, thus helping to keep the airfield open. If memory serves me it came into use late 30's and certainly the 40's saw some limited de Haviland test flying from there, it also acted as a decoy for the Hatfield site against the attentions of the Luftwaffe