Flooding has hit parts of London after heavy rain overnight, causing transport closures.
Workers in Knightsbridge, west London, have found their offices closed, while motorists have struggled to navigate waterlogged roads as a result of the heavy rains.
Two Tube lines and parts of the London Overground have been shut down.
Torrential downpours caused by an eastward-moving cold front have impacted other parts of the UK, forcing the closure of the M23 in Sussex.
The District line between Earls Court and Barking has been closed due to flooding at Gloucester Road, according to Transport for London (TfL).
Due to flooding at Imperial Wharf, London Overground has no service between Willesden Junction and Clapham Junction.
Previously, the Piccadilly line experienced significant delays due to a power supply issue, while the Metropolitan line was impacted by flooding at Aldgate.
According to the Met Office, 35mm of rain fell on St James’s Park between midnight and 6:00 a.m. BST.
The rain has also forced the closure of the M23 in Sussex between junctions 10a and 11.
The torrential downpours were caused by a cold front sweeping eastwards.
London has previously seen flash flooding during the summer.
At the scene: Greg McKenzie, BBC London
Overnight, a number of clothing stores in Knightsbridge were flooded. Six hours’ worth of rain fell in some areas in a matter of minutes.
The London Fire Brigade arrived around 07:00 to clear a number of blocked drains, but they were unsuccessful.
It has checked the flooded shops, but they are all still closed, with firefighters unable to gain access.
Despite the fact that traffic is still moving, there are massive puddles everywhere as employees who are unable to get to work wait outside.