They're a bit bigger than ponds.
I fish the coarse reservoirs and the Copper Mill stream that runs between them quite a bit for pike. But I've never had anything from any of the reservoirs only the stream, from which I've had a few reasonable fish.
I'm not sure what fish you're looking for. The coarse boys that are fishing are pretty focused on the carp, but I never seem to see anyone catching anything. I believe that it's known as a headbanger of a venue. They're certainly all fishing off at distance. If carp are on your mind I'm not sure that it would lend itself to fly-fishing. However come the summer it might be worth throwing some dog biscuits and seeing if anything comes up for them.
An issue at Walthamstow is the cormorants which have apparently decimated the coarse fish stocks. I always tend to takes things like this with a pinch of salt, but there are certainly cormorants around.
One interesting option is that one of the coarse reservoirs also has quite a few trout (Upper Maynard I think), which you can fish for on the coarse ticket.
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