yeah, we were briefly there a few weekends ago. after he had cut down the rope swing, the park ranger told us that the river is (usually, at least) very heavily polluted and there's a real risk of Weil's disease. doesn't seem to have put off the swimmers though.
Is that really true or a useful urban myth for the park ranger?
Drinking water is still taken from the Lea (then filtered) and it has pretty good wildlife these days.
We were cycling through Hackney Marshes today for our lunchtime exercise and heard a commotion on the other side of the river....