The memorial service for Dad's Army writer David Croft is being held at St Martin-in-the-Fields in Trafalagar Square in London.
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Early frost and freezing fog patches for many areas. The fog may linger in places, where it will remain cold.
Search teams were again looking for missing airman Corrie McKeague - this time joined by cadaver dogs trained to seek out human remains.
The forecasters are using just one word to sum up the next few days: cold.