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Hidden in a picturesque corner of Stoke Newington, this facility is a sports and environmental education centre that offers regular courses in sailing and kayaking for all ages and abilities – and year-round cold-water swimming. Previously, swimmers had to wear a wetsuit when the water temperature was below 16C, but you can now hop in at all times of year wearing nothing more than some speedos, a swimsuit or a bikini (if that’s your thing). But remember, it’s an English reservoir, not some tropical beach.