UK Signed Divorce Treaty with EU, Boris Johnson Congratulated for Brexit

UK Prime Minister Boris Johnson hailed "a new chapter" in Britain's history as he signed its divorce treaty with the EU, clearing another hurdle before the country exits the bloc next Friday.

It allows Britain to end its decades-long membership of the European Union and leave its closest neighbours and trading partners after several years of domestic acrimony and delays.

"The signing of the withdrawal agreement is a fantastic moment, which finally delivers the result of the 2016 referendum and brings to an end far too many years of argument and division," Johnson said in a statement.

"This signature heralds a new chapter in our nation's history," he added on Twitter, alongside a photo of the occasion.

Johnson signed the agreement in Downing Street, seated in front of two Union Jack flags, with European and British officials who had brought it from Brussels looking on.

EU chiefs Ursula von der Leyen and Charles Michel had already put their names to the treaty overnight at a ceremony held behind closed doors in the early hours of the morning.

It will now return to Brussels, where the original will be kept in EU archives along with other international treaties, while three copies will be dispatched back to London.