alerts as the country is battered by bad weather.
Workers commuting back to towns and cities will have to tackle difficult driving conditions on many roads and travel disruption on trains and at airports remains a problem.
It comes after most of the UK saw heavy snow or icy rainfall over a wintry weekend that had two larger amber weather warnings.
runways for several hours due to heavy snow, while there were stranded vehicles and collisions which blocked key roads across northern England.
A yellow rain warning for southern England from Cornwall across to Kent will last until 9am on Monday, while a separate rain warning covering much of Wales, the Midlands and parts of Greater Manchester and Yorkshire is in force until 8am.
A yellow warning for snow and ice covering most of northern England and Wales is in place until midday on Monday, while a yellow ice warning covering large parts of Northern Ireland expires at 11am.
The north and west of Scotland are covered by a yellow warning for snow and ice until 11am on Monday, with another for snow and ice in central and eastern parts of the country in place until midday.
The Environment Agency had issued 166 flood warnings, meaning flooding is expected, and 299 flood alerts, meaning flooding is possible, across England as of 6am on Monday. National Resources Wales had issued three flood warnings and 34 flood alerts.
It said a combination of melting snow and rain could lead to "significant river flooding" in areas of Lancashire and Warwickshire on Monday, and it advised people to stay away from swollen rivers and to not drive through flood water.
Cold air will return and remain across the whole country from Monday onwards after a brief spell of milder conditions in southern areas, the Met Office said.