Overnight conditions have seen snow fall in the West with flights cancelled at Bristol Airport.
It also closes the British Council in Russia - amid tensions over the nerve agent attack on an ex-spy.
The riot caused £850,000 worth of damage and led to 120 prisoners having to be re-housed.
Russia is behind the attempted murder of an ex-spy and his daughter in Salisbury, the PM believes.
Steve Cooper was in the the Mill pub in Salisbury where traces of a nerve agent have been found.
There are postponements to a number of sporting events across England on Sunday because of snow.
Former Southend boss Phil Brown guides Swindon Town to a win at Cambridge United in his first game as manager.
Wiltshire Gazette and Herald
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