LONDON (AFP) - Buses and cars were left stranded when roads across London flooded on Sunday (July 25), as repeated thunderstorms battered the British capital.

Emergency services were battling "significant flooding across London", Mayor Sadiq Khan tweeted, adding that all public transport services were affected and advising people to avoid walking or driving through flooded areas.

Social media users posted videos of partially submerged vehicles in south-west London.

More heavy rain is set to fall as a band of thunderstorms makes its way across south-east England.

The Met Office issued an amber weather warning across London and surrounding counties until 7pm local time (2am Singapore time).

It warned there was a risk of lightning strikes and flooding, with up to 10cm of rain forecast to fall in some areas, almost double the monthly average for July.

Police closed a road near Queenstown Road station in south-west London, where three double-decker London buses were stuck under a railway bridge, according to an AFP journalist.

A driver, who gave his name as Eric, said passengers had to get off after his bus started taking on water.

Other motorists in Walthamstow, north-east London, abandoned their vehicles as the rain hammered down.

The police said they were "currently dealing with numerous floods in the east," warning that tunnels and roundabouts were submerged.