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Friday night was the coldest night of the winter so far.
Temperatures plummeted close to minus 18 in some areas.
Experts say the mercury fell to -17.8C in Chesham, Bucks, during the early hours of Saturday morning and was expected to plunge even lower as the icy weather continues to grip the UK.
The record-breaking cold snap comes as families setting off on half-term getaways have been warned of "deceptively dangerous" road conditions.
The Met Office say temperatures in London will struggle to get above freezing on Saturday with lows of minus 11 expected in London on Saturday night.