Snow has reached London this evening, causing rush-hour travel chaos, only a few hours after the Met Office issued multiple warnings of unsettled conditions throughout the day. Videos on social media have begun surfacing showing heavy snowfall in Croydon and East Finchley. Elsewhere, in Sussex near Brighton, cars have been seen skidding on the roads as visibility worsens and surfaces become slippier.
In Devon and Cornwall - both affected by the Met Office weather warnings - police have urged people not to drive until the snow passes and to only make "absolutely necessary" journeys. Also in the South West, the Met Office issued a rare amber warning for snow, which could accumulate up to four inches as temperatures could plummet as low as -12C. This is a live blog.
Scroll down for the latest updates. Heavy snow reaches East Finchley, north London Video outside @Phoenixcinema - one of the UKu2019s oldest cinemas #uksnow #londonsnow pic.twitter.
com/eZXHyZA2Ur Temperatures will fall into negative double figures in the coldest areas during the next few nights and a few locations may see minimum temperatures as low as minus 16 Celsius ud83eudd76 pic.twitter.com/gHiui2CS6a A frosty and icy start to Wednesday for many Sunshine will break through the wintry showers in the north but freezing fog patches are possible, particularly across Northern Ireland Cloud will build in the south as rain and possible snow fringes southern counties of England pic.
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Snow tracker LIVE: Polar blast sparks rush hour chaos as heavy snowfall reaches London
Two to five centimetres of snow could build fairly widely with as much as 10cm over higher ground.