The link has been posted before on PPRuNe, but not recently.
Aerial Views Of UK Airports & Airfields
Good grief. I idly followed the link, and equally idly looked up "Wimbledon", for no reason other than I used to live there.
To my immense surprise, I found it listed. The link shows an area of the Common, plus some football pitches, near the A3. But nothing at all resembling an airfield or anything large enough to have once been one.
There were a load of AA batteries on the Common during WW2 - I once found a fragment of shrapnel from a shell they fired - and there were rifle ranges there before this activity moved to Bisley. Also the TA practiced manoevres there, but both these latter two were pre-WW1. Local anecdotes never, ever, mentioned aeroplanes in connection with the area.
Giggling reveals precisely zilch. Anyone know anything?