Ask a Londoner and they will tell you the city comes alive in the summer. People start pouring into beer gardens, after-work picnics become a mainstay in the parks and even Tube commuters start to crack a smile. The only downside is that Britain still does not have the infrastructure that hotter climates do to keep things cool. Luckily for city dwellers, however, there are ways to control the temperature despite our lack of air conditioning, and one of the most popular methods is heading to the nearest water source for a swim. London has a surprising number of options, from lidos and lakes to sports centres and private pools, many of which become easier to enjoy in the summer with longer opening times and more activities for kids on school holidays. Many are also adapted to be accessible, with ramps, poolside hoists, poolpods and changing rooms accommodating for all, while those who don’t have a big budget to spend on club and hotel pools can find places to swim for free or at a lower cost.…