Greycoat, part and part. K3k3 - pre-HAS.
QRA aircraft in the Q pens had gates on wheels. The V-force did not. In the FOA arming would obviously take place when tensions were higher and shooting wheels would have been an option.
A single word amendment to the 814, in 1978 or thereabouts, changed that and we had gates and fencing at ISK for the Nimrod too.
Obviously HAS improved security all round.