Theresa May is to meet Emmanuel Macron on Friday as she steps up her efforts to win backing for Brexit plans.
The UK prime minister is cutting short her holiday for talks at the French president’s summer retreat.
It comes after UK Brexit Secretary Dominic Raab held talks with his counterparts in Paris on Thursday.
The UK’s former ambassador to France has warned Mrs May not to expect a Brexit breakthrough in her talks with the French president.
Lord Ricketts told the BBC that Mr Macron was “the last person” to want to break ranks with the rest of the EU to push for a softer stance from Brussels.
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Mr Macron “doesn’t believe in softening” the position on Brexit as “he is a passionate pro-European”, the peer said.
Mrs May spoke by phone to European Commission President Jean-Claude Juncker about Brexit and global trade on Friday morning, ahead of her meeting with Mr Macron.