Don't forget Hendon.
Only a little south of Elstree. I seem to remember a PPL 'unsure of his position' landing there in (I think) 1965 after it was closed. Got into a spot of bother for this and also because he was inside the zone!
WATford 279 was a very useful marker for Elstree and GARston VOR (112.3) was situated on Leavsden airfield in those days. Now replaced by BOVingdon of course.
Putting a DH125 into Leavsden was VERY exciting indeed in the mid sixties!!!
Anybody remember the Elstree Air Display of 1967 when the Red Arrows managed a display there and a Lightning shook most of the teeth in Watford with a low and very fast run? Neil Williams managed to display one of the replicas (Bristol Boxkite, I think) which had been constructed for and used in Those Magnificent Men.....