Tooting Bec Lido

South London's vast pool, with its iconic, Pantone-coloured changing huts, has been treasured by fortunate locals since it opened as a bathing lake in 1906. At just over 90m, it's this country's largest outdoor freshwater pool and inspires devoted swimming all through the year (to swim in winter you must be a member of the well established South London Swimming Club, which has been based at the lido almost as long as it has existed). Facilities include a paddling pool for kids, a café, and lockers for small valuables.