Parliament Hill Lido

Built in 1938 and refurbished in 2005, the Grade II-listed Parliament Hill Lido measures a generous 60 metres by 28 metres. It has a stainless steel pool liner (the only one in an outdoor pool in the UK) which gives the water a metallic shimmer – not that you'll be able to tell when it's packed full of people on a sunny day. The lido is unheated, but wetsuits are permitted at the lifeguard’s discretion. There's a paddling pool for under-fives and a cafe and it’s right next to one of the best views of the London skyline, so take a walk up Parliament Hill on a clear day, post swim.