Verdant thinktank says cost could top £25bn a year by 2030 and calls for maximum temperature for working and urban redesign to cool down cities

Repeated debilitating heatwaves this summer are likely to have cost the UK economy more than £4bn in lost economic output by the end of July, new analysis shows.

Green thinktank Verdant had suggested June’s unseasonally hot weather had an economic cost of £2.36bn. Updating its assessment to include last month’s high temperatures, it finds a £4.4bn hit to output.