Comment by Basil Clarke on October 8, 2014 at 22:21

I was once told that the Bounds Green Industrial Estate (The Ringway N11) sits on top of the mountain of spoil from excavating the tunnels for the Piccadilly Line extension.  It's certainly a bit of a climb up to the industrial estate from the north west end of Bounds Green Road, near the junction with the North Circ.  But looking at the OS map, I see that the contours continue to climb in the same direction over a larger area - so maybe I was having my leg pulled!

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