I came across this one by accident one day:-

* https://www.remotelondon.com/wisley-airfield-an-abandoned-ru...

Doing a long bike ride to visit a friend, the route I'd plotted suddenly found me in the middle of a big old runway, weird to see given it's alongside one of the major routes into London (one I've driven or motorbiked many times, but never cycled). Quite the shock to see, especially as it was a scramble to get through the bushes and cross the A3 to Wisley RHS.