But it's not banned. You can officially swim at a bunch of places, including the disgusting inner London Docklands area, as well as the dock2dock event. I think

But it's not banned. You can officially swim at a bunch of places, including the disgusting inner London Docklands area, as well as the dock2dock event. I think the idea is that it's fine providing you don't swallow any of the water... Everyone I know who's done it (mostly from my tri club) has gotten ill afterwards.