This week could see the hottest day of the year so far

48C

Temporary speed restrictions are introduced when train rails reach this temperature

41.5C

Temperature on the tube during 2003 heatwave

38.5C

Highest daytime temperature recorded in the UK, 10 August 2003 near Faversham, Kent

33C

Tarmac roads may begin to melt

24.5C

A rise in deaths may become apparent

24C

If temperatures persist for three days in a row, London Underground supply bottled water

48C

Temporary speed restrictions are introduced when train rails reach this temperature

41.5C

Temperature on the tube during 2003 heatwave

38.5C

Highest daytime temperature recorded in the UK, 10 August 2003 near Faversham, Kent

33C

Tarmac roads may begin to melt

24.5C

A rise in deaths may become apparent

24C

If temperatures persist for three days in a row, London Underground supply bottled water