The European Union's Brexit negotiator Michel Barnier has said that the UK has yet to provide "legal and operational" proposals that could break the Brexit impasse.
"We are still ready to work on any new legal and operational proposal from the EU," Mr Barnier told reporters on arriving for talks with European lawmakers on the latest developments on Brexit.
"We are still waiting for this."
Mr Barnier declined to comment on the spiralling political crisis in Britain, where parliament resumed yesterday after the Supreme Court ruled that Prime Minister Boris Johnson unlawfully suspended it.
Mr Johnson has vowed to take the UK out of the EU on 31 October with, or without a deal to manage the fallout.
Britain submitted its fourth technical paper to the EU this week to detail its proposals on customs arrangements after Brexit, diplomatic sources told Reuters, as London seeks to replace the backstop in the stalled divorce treaty.
But the EU says London's ideas - on food and animal checks, customs and regulatory controls, checks on manufactured goods and market surveillance, among others - fall short and are not acceptable as alternatives.