Similar reflections on Kempton, although any green space within the M25 should be protected at all costs.
A lot of stages have to be gone through before any homes can be built. Back in October I went down to see what is left of Folkestone. Surprisingly it's still very much in tact:
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Since it closed in 2012 there's been a plan to build a whole new town on top of it, but I gather Homes England haven't provided any funding so far. 2027 a likely start date.
I never got down there while it was going but think of horses like Hunt Ball and the Barney Curley / Big Mac / Luke Harvey episode. Apparently jockeys and trainers didn't like making the journey to that corner of the country, and when ARC bought it the land value was the selling point. Hopefully there's not too many more that follow.