The government has issued its first warning under a new system designed to alert people to the dangers of heatwaves.The UK Health Security Agency (UKHSA) and the Met Office have issued the first heat-health alert in six regions: London, West Midlands, East Midlands, South West, East of England, and South East.It will be in place from 9 am on Friday until Monday morning.Dr Agostinho Sousa of the...