Heron Lake, Wraysbury, Middlesex, TW19 6HW

Offering swimming on Saturday, Sunday, Monday and Wednesday, Heron Lake is £5 per session, £40 for a block of 10 or £300 for a 100 session card. There are hot showers, toilets, wetsuit hire and even accommodation if you pre-book.

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www.openwaterswimminguk.co.uk