Youngsters have been wondering if they might be sent home in a record breaking heatwave (Image: Getty Images) The UK government has released guidance for headteachers regarding temperature thresholds and the conditions under which schools ought to shut. Britain is braced for record-smashing temperatures that could rocket beyond 38C, as extreme heat warnings and health alerts have been put in place. According to the Met Office, the scorching conditions could persist until at least Thursday, triggering weather warnings and raising concerns for vulnerable individuals. The UK Health Security Agency (UKHSA) warned people to expect significant impacts across health and social care services along with a rise in deaths, particularly among those aged 65 and over or with health conditions. The Department for Education has issued guidance on whether schools should close during hot weather – and what measures ought to be implemented to ensure pupils remain protected. The heatwave is predicted to be so severe this week that it could also cause disruption to rail, road and air travel, with the possibility of some tarmac …