European Union's chief Brexit negotiator Michel Barnier has said the bloc is prepared to offer the UK an unprecedented close relationship after it quits the EU, but it will not allow anything that weakens the single market.
"We are prepared to offer Britain a partnership such as there never has been with any other third country," Mr Barnier told reporters in Berlin after a meeting with German Foreign Minister Heiko Maas.
He said the relationship could include economic as well as foreign and security policy ties.
"We respect Britain's red lines scrupulously. In return, they must respect what we are," he said.
"Single market means single market ... There is no single market à la carte."
It comes as Britain's Brexit Minister Dominic Raab said the UK and the European Union have a deal "within our sights", on the terms of the deal.
He was outlining his government's Brexit plans to politicians in Westminster.
Asked by members of the House of Lords whether a deal would be reached at an EU summit in October, Mr Raab said that remained his goal, but that there was "a measure of leeway" over the exact timetable.
Last week, he said he was confident of reaching a deal when he was setting out government advice to businesses on how to prepare for any failure to do so before the UK leaves on 29 March 2019.
Mr Raab said he would be heading back to Brussels for negotiations on Friday.
He said resolving the thorniest issue of the talks - how to avoid a "hard" border - would require "innovative" answers.
He hinted that the UK could be willing to compromise on giving some role to EU institutions, such as the European Court of Justice, in reaching an agreement on the border between Northern Ireland and the Republic.
When asked about the court, Mr Raab said he did not want to add extra red lines that would make getting a deal more difficult.
Mr Raab admitted that the deadline for agreeing a divorce deal with the EU may slip.
Asked to confirm when a deal will be done, he said the government is still "aiming" for October, though "there is some measure of leeway."
Officials on both sides say an agreement by October is unlikely, and they are now aiming for a mid-November deadline.
The longer timeframe is an indication that negotiators are struggling to make headway, and the risk is that the closer talks run to the UK's exit on 29 March the greater the chance that there will not be a deal.
