Welcome to this new series of East London Walkables, placed in such a way that one who might need to go out for a walk to get a cache, could do just that. Even if it's not feasible to drive around to go caching.
You can get just one at a time, or you can blitz them all in a row. Enjoy!
At the posted coordinates, there used to be a stump. Before that, a tree. Since those are both gone now, proceed to stage 2 at N42° 59.916' W081° 11.112', and observe the number on the telephone pole above the plaque which says "Copper Clad Steel, No Scrap Value". The pole label reads:
T ABCDE.
Calculate: F = C + D.
The cache can be found at N 42 59.82E W 081 11.03F.