Britain's King Charles has cancelled a state visit to France after social unrest over President Emmanuel Macron's new pension law erupted into some of the worst street violence seen in years across the country.

The postponement will be a major embarrassment to Macron, who had hoped the monarch's visit would mark a symbolic step in the two countries' efforts to turn a page after years of poor relations post-Brexit.

Charles had been due to travel to France on Sunday for three days before moving on to Germany, an itinerary that had been seen as a win for the French leader who had sought to position himself as Europe's de facto leader.

The King's visit had been due to include a lavish banquet at the Palace of Versailles and the postponement will pile further pressure on Macron to find a way out of a crisis over his plans to raise the retirement age, which has seen some of France's worst unrest since the 'Yellow Vest' rebellion of 2018-2019.

READ MORE

Anger grows over French pension reform

UK parliament bans Tik-Tok

EU plan for Europe's green revolution

"The King and The Queen Consort's State Visit to France has been postponed. Their Majesties greatly look forward to the opportunity to visit France as soon as dates can be found," a Buckingham Palace spokesperson said.

A source in British Prime Minister Rishi Sunak's office said Macron had asked for the visit to be cancelled.

The Elysee said it was a joint decision taken by the British and French governments after trade unions called for a further day of nationwide strikes and demonstrations during the King's visit.

"The visit will be rescheduled as soon as possible," the Elysee said in a statement.

A Buckingham Palace source said Charles' visit to Germany will go ahead as planned.

Subscribe to Storyboard: A weekly newsletter bringing you the best of CGTN every Friday