Theresa May has now signed a letter to trigger Article 50, the start of the official process to leave the EU.
Widespread Frost As Temperatures Plummet Again
Widespread frost is expected across much of Scotland as temperatures plummet for a second night.
The Met Office has issued yellow warnings of ice, stretching from the northern half of Scotland down to northern England up to 11am on Wednesday.
Overnight minimum temperatures were expected to drop to around minus 8C or as low as minus 10C across the highest ground in Scotland, and minus 3C in Scottish cities.
Further south temperatures will sit around freezing in built up areas - with a widespread frost.
The Met Office has warned that patches of freezing fog are expected.
Temperatures will struggle to rise above 0C on Wednesday morning across much of the country.
Motorists are being warned to look out for icy patches on untreated roads into Wednesday with difficult driving conditions expected.
Towards the end of the week, temperatures are expected to warm up slightly as less cold air edges in, bringing rain with it.
The Met Office said the coldest spot in the UK on Tuesday night and into Wednesday morning was at Kinbrace in Sutherland, northern Scotland, where the mercury dropped to minus 10.6C.
The Highland village had experienced the coldest night of the year so far with temperatures falling to minus 12.4C in the early hours of Tuesday.
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