"Boris Johnson will address the nation tonight, describing Brexit day as the "dawn of a new era".
The Prime Minister will address the nation to say Brexit marks "not an end but a beginning".
In a symbolic move, Mr Johnson will chair a meeting of his Cabinet in Sunderland, the city which was the first to back Brexit when results were announced after the 2016 referendum.
Number 10 has billed a speech by Boris Johnson as an "address to the nation".
Mr Johnsons speech will be aired in full an hour before the moment the UK leaves the EU."