The Met Office is predicting temperatures to rise to the mid-30s on Thursday, with a heat-health alert coming into force. The UK Health Security Agency (UKHSA) has issued the alert, which is set to begin at 9am on Tuesday and continue until Friday evening. Read moreIn London, temperatures are expected to reach 25C on Tuesday before climbing higher later in the week. Amber heat-health alert issued as scorching weather returns to the capital (Image: Press Association Images)An amber heat-health alert has been issued for most of England, including the Midlands, South East, North West, and South West. The Met Office predicts that this week's heatwave, with temperatures set to peak at 36C on Thursday, will be the fifth of the year.