This is the FT's take on the meeting:
Number 10 looks to steer Brexit talks in Juncker-Barnier meeting
May seeks low-key negotiation while EU wants more transparent approach
Theresa May began to try and exert a personal grip on Brexit negotiations when she met Michel Barnier, the chief EU negotiator, for the first time on Wednesday night at a dinner in Downing Street.
The dinner, which was also attended by European Commission president Jean-Claude Juncker and other senior Brexit negotiators, was a sign of the prime minister’s intention to steer the talks that will define her premiership if she wins the general election on June 8.
Britain is pressing for low-key technical talks, with the details of negotiations kept under wraps, while the EU is looking for a more transparent approach.
Mrs May’s preferred format would put the emphasis on discussions among officials, giving a less prominent public role to senior politicians, including most notably David Davis, the Brexit secretary.
Mr Davis is trusted by Mrs May — he was among the ministers briefed in advance about the snap election — and attended Wednesday’s dinner, but his statements and activities have been closely scrutinised for signals about the government’s Brexit aims.
Olly Robbins, a highly regarded civil servant and Mrs May’s lead “sherpa”, will play a key role in the negotiations, as will Nick Timothy, her co-chief of staff, who is drafting the Conservative manifesto.
But mixed signals over the make-up of Britain’s negotiating team have caused confusion in Brussels.
“It is very strange,” said one senior diplomat for the remaining 27 EU member states (EU-27). “We need a politician on the other side.”
British officials said that details of the negotiating strategy and team were still being decided.
As the EU’s chief negotiator, Mr Barnier, a former French foreign minister and two-time European commissioner, was expected to engage principally with Mr Davis in formal negotiations. The two had tentatively scheduled a meeting, soon after last Saturday’s summit of EU-27 leaders, for “talks on talks” that would set the format and tempo of discussions over coming months.
However, that meeting was cancelled after Mrs May last week called a snap general election and she invited Mr Juncker to Downing Street instead.
Mr Juncker brought Mr Barnier, Sabine Weyand, the EU’s deputy negotiator, and Martin Selmayr, his chief of staff. Mr Selmayr, a powerful operator in Brussels, was expected to meet Mr Timothy, his influential counterpart in Downing Street, for the first time at the dinner.
Number 10 said after the dinner that Mrs May and Mr Juncker had “a very constructive meeting”.
“Following the UK’s letter of notification under Article 50, she reiterated the UK’s commitment to achieving a deep and special partnership with the European Union,” a spokesman said.
In recent weeks, Mr Robbins has stressed to other European diplomats that Mrs May wants to depoliticise the preparations for Brexit as much as possible, and keep the details of discussions quiet.
This contrasts with the commission’s plans for a more transparent and ordered process, where all of its main negotiating position papers would be public. Mr Barnier is advocating for week-long “negotiating rounds” taking place around once a month, which would potentially involve Mr Davis and Mr Barnier giving press conferences. The “heavy lifting” on technical matters would be left to Mr Robbins and Ms Weyand.