Cirencester Pool Gloucestershire
One of the most picturesque lidos in the UK, this 28m pool is silhouetted by the ramparts of a faux-medieval castle. It’s also one of the few outdoor pools to be heated, to a positively balmy 27°C no less. It’s filled with natural spring water and has been serving the local community since 1869. Aside from the main pool and water slide, there’s a separate kiddie’s pool and sunbathing terrace. The old-school ‘tuck shop’ is a big draw for younger paddlers, serving sweets such as rhubarb and custard, aniseed balls and sherbert lemons by the quarter. Picnics are welcome, though the café, being right on the River Churn, offers local fish and produce, with discounted rates available to older guests.