Snow continued to fall over parts of south Wales and south-west England overnight as the cold spell carried on, forecasters have said.
The Met Office has amber weather warnings for snow in force, affecting these areas of the country.
But BBC weather forecaster Alex Deakin said there was an end in sight to the cold and wintery weather that has caused problems for the past five days.
He said snow flurries would ease down through Wednesday morning.
Milder, wet and windy weather would arrive for the weekend, he added.
Fresh snowfall caused further disruption as sub-zero temperatures and icy conditions affected the UK for a fifth successive day and night.
Hundreds of schools across the UK were closed for the day on Tuesday but far fewer than on Monday.
Flights at some UK airports were cancelled and delayed, and roads and rail networks were also affected.
In other developments:
Heathrow cancelled dozens of flights on Tuesday and warned passengers to expect further cancellations and delays, as the airport normally runs at almost 100% capacity and there is no slack in the system.
There were also delays at airports including Gatwick, Birmingham, Stansted and Luton.
National Rail said all UK train companies were expected to run a full service on Wednesday.
A Met Office amber weather warning means people should "be prepared".
Less severe yellow warnings for snow and ice - meaning "be aware" - are in place for most of the rest of the UK.