Get ready to sweat and panic, as weatherman Alex Beresford concludes his nerve-jangling series with a look at Britain’s increasing vulnerability to heatwaves. We all enjoy a spot of sun, but these extreme temperatures are highly dangerous. Beresford shows how they can damage crops, shut down transport and give people severe heat exhaustion.He also explores the dramatic history of some notable heatwaves, including the long hot summer of 1976. People who lived through it still speak of it fondly, but Beresford reminds us that two months of prolonged warm temperatures caused a serious drought at the time. There’s one in the eye for nostalgia.