I too grew up in Perivale 1935 to 1960 and played on Horsenden hill as a child as often as time allowed, playing "cops & robbers" and "cowboys & Indians" .
The ruined house opposite the old Ballot Box we used to call the "Chinks' House" and
explored among the undergrowth and remember the mosaic floor tiles.
There is now an underground water storage reservoir on the hillside.
My youngest Son, a potter, fired me a beautiful small inscribed mug made from Horsenden clay.
I visit the Hill nearly every time I am in the UK, ... many fond memories of play friends
& fun on the Hill & Woods.
Something is not right. This message is just to keep things from messing up down the road