The new summit location and the old one both lie within the present activation area, and I don’t think its shape changed much when the summit was re-located.
The summit is at 269 metres, so I think the SOTA activation area would be enclosed by the 244 metre contour. At one scale, streetmap.co.uk provides contours at 5 metre intervals, and the 245 metre contour is close enough to be useful and on the safe side.
The activation area is huge. To the east, it stretches as far as the “Clarks Lane”/“White Lane”/“Approach Road” junction (and up “Approach Road” about as far as that little zoo). To the west it goes as far as the turning where “The Ridge” turns into “Northdown Road”. To the north it ends at the point where the track called “Upland Road” joins “Croydon Road”. It covers parts of IO91xg, IO91xh, and JO01ag. While most of it is in TQ35, there’s part of it in TQ45.
The catch is finding a place that isn’t on private land, but I figure the car park with a view above the quarry is probably a valid spot…