The cycle lane on the B160, Chingford. Not a good idea to leave the lane though, since the road goes downhill and motorists come belting down at 50 mph or so (yes, it is a 30 mph zone).
And the grisly cycle lane (on the right, below) besides Walthamstow Greyhound Stadium could do with some weeding too.
Neglect: omnipresent in the cycle lanes of the London Borough of Waltham Forest. Just like the pavements...