London weather LIVE: 'Stay indoors between 11am and 3pm', MP warns as temperatures peak

34C or even higher todayThe temperature is set to spike sharply this afternoon with a high of 34C or even 35C on the cards.It could be as much as six degrees Centigrade above yesterday’s high in London.Parts of the UK are in their fourth heatwave of the year.But whether London is in a heatwave this week is too close to call, with temperatures potentially dropping below the 28C threshold tomorrow. A heatwave is declared in London when the mercury reaches 28C on three consecutive day.A high of 29.9C was reached yesterday, but it didn’t get any warmer than 27C on Monday. Good morningWe’re launching our coverage of weather on what is set to be another extremely hot day in London.Temperatures are forecast to reach 34C or 35C in the capital this afternoon as a fourth UK heatwave of the year peaks. We’ll keep you informed of the major developments as the temperature rises over the next few hours.