Train companies operating revised timetables include East Coast, ScotRail, First Great Western, South West Trains, Southern and Southeastern.
The breakdown of a train travelling from Brussels to London in the Channel Tunnel on Thursday has affected Eurostar services.
Supplies of road grit are close to running out in some areas, and many councils are restricting gritting to major roads.
Thieves using a lorry with heavy lifting-gear have stolen a grit bin with two tonnes of salt intended for streets and footpaths from a road in Newton Mearns outside Glasgow.
The Local Government Association admitted reserves were "stretched", while the government is helping suppliers prioritise areas most in need.
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