Road and rail travellers have been warned to expect disruption as snow falls across England and Scotland.
Yellow warnings for snow and ice were issued in northern Scotland, northern England and parts of Northern Ireland, the Midlands and northeast Wales.
National Rail said the weather could affect Northern Rail services, especially those in the Calder Valley, southern Pennines or Peak District.
National Highways issued an amber severe weather alert across the North East and North West, with 15cm of snow possible on roads and motorways, including the M56 in Manchester and the M1 at Leeds and Sheffield.
Slow progress on the roads in Leicester on Tuesday morning
STEPHEN HUNTLEY/HVC
Making the most of it in Birmingham
SWNS
Embracing the chill factor at the West Reservoir in London
TOM BOWLES
The UK Health and Security Agency (UKHSA) said that over-65s, vulnerable people and those with existing health conditions could be at risk as Britain suffers its first taste