Wide swathes of Britain are set to be lashed by heavy rain on Wednesday before heatwave conditions return later in the week. A wide area of northern England, Scotland and Northern Ireland will be drenched, with weather maps showing a band of heavy rain moving across the country. The forecast for Wednesday reads: "Cloud and rain across Northern Ireland will spread eastwards into Scotland during the day, with some heavier bursts possible. Elsewhere, it will be largely dry, with variable amounts