The government has temporarily relaxed the legal restrictions on the length of time lorry drivers can work to help ease the backlog caused by snow.
Transport Secretary Philip Hammond said allowing hauliers to drive for an extra hour a day for the next four days would help deliveries of "vital supplies".
Royal Mail reported problems with about 10% of deliveries on Friday, and pumps at hundreds of garages could run dry.
Forecasters are warning freezing conditions could continue next week.
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