Water safety experts have warned about the dangers of outdoor swimming after nine drownings in the UK heatwave . Seven young people and two adults have lost their lives in rivers, lakes, reservoirs and the sea as people take the plunge to cool off in the 35C heat. They warned of ‘cold shock response’ as the water will still be at winter temperatures, causing hyperventilation which often leads to drowning. Junior Slater was the latest youngster to be identified after his body was recovered after