Which Tube lines have air con? How best to survive a heatwave on the London Underground

Some 60 per cent of the London Underground network does not have air conditioning - (Getty Images)

As London heats up for another week of temperatures topping 30C, staying cool on commutes across the capital has become a mission for many.

Although those travelling on the Elizabeth line, London Overground and London Trams can enjoy fully air-conditioned carriages, most London Underground lines do not offer the same luxury.