The soaring temperatures have led to hundreds of school closures, or partial closures, across London and southern England.

Transport for London warned passengers that “very high temperatures may cause disruption to some Tube and rail services, particularly the London Overground and Elizabeth line”.

These two services share rail infrastructure with Network Rail, which said the hot weather could affect overhead lines, the tracks and signalling equipment.

Network Rail urged passengers to “only travel if absolutely necessary to, from or within red warning zones” and to stay hydrated.

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