German Chancellor Angela Merkel said leaders of the 27 nations who want to remain in the European Union agreed on Wednesday there would be no treaty changes and that the future approach should be “simple and unbureaucratic.”

“The trend was clear: No treaty changes,” she told reporters after EU leaders held their first summit talks in 43 years without the U.K. present. Britain’s David Cameron attended what was presumably his last summit as prime minister on Tuesday, but was not invited to Wednesday’s talks about the future direction of the bloc.

“There was no one today who thought we need a convention and a new treaty,” Merkel said, describing the EU’s Lisbon Treaty as fit for purpose.

European Commission President Jean-Claude Juncker had the same message, telling reporters the EU should implement the reforms that have already been agreed rather than launching new ones, and that leaders agreed there should be no treaty change.

They both reiterated there would be no negotiations about Britain’s future relationship with the EU until London has formally launched divorce proceedings by invoking Article 50 of the Lisbon Treaty.