I wish Bob Milne's daughter Jenny was here to see your reply...
There's no doubt it was a hairy airfield to operate from, but it did more than it''s' usual bit;
Bob noticed a clear pathway at 500' below the barrage balloons straight to Portsmouth docks, reported it and took up the local council person responsible to show; it was immediately closed, but Bob always wondered if that clear path had been down to ' 5th columnists '.
He also kept a count of the Luftwaffe bomb craters every day he flew - Langstone, just East of Portsmouth, had quite a lot of sophisicated decoys - which worked well.
I now sail from Langstone Sailing Club ( on the Eastern Chichester side ) where we dig our own moorings - one day a new chap, very fond of his hard hat & elf'n'safety', turned up with a ' risk assesment ' form.
I asked him about standing & digging moorings on tons of unexploded Luftwaffe ordnance, and he hasn't bothered me since.