Prime Minister David Cameron will return to Brussels to try and secure a European Commission post for Britain today.
After failing to prevent Jean-Claude Juncker being installed EU president, Mr Cameron has announced that Lord Hill of Oareford is the UK's nomination to serve in his team.
The Prime Minister's spokesman said the peer would be treated with "very very considerable respect" by EU figures.
"In terms of the UK portfolio, our view about the importance of economic priorities to us hasn't changed and Lord Hill's nomination is fully consistent with that," the spokesman added.
European Union heads of state and government are set to attend the EU summit tomorrow, after Jean-Claude Juncker was elected head of European Commission.
The European Commission's newly-elected head Jean-Claude Juncker found himself heckled by Eurosceptics in the European Parliament. Mr Juncker told MEPs (in French): "The single currency protects Europe." He was subsequently heckled by some who deemed it "rubbish".
He accused Ukip leader Nigel Farage, a staunch opponent of the appointment, of "secretly" voting for the former leader of Luxembourg.
Mr Juncker addressed him (in French): "I'm led to believe that your Parliament will vote by a secret ballot. And I understand that, because Mr Farage wouldn't want his voters to discover he voted for me".
The appointment of Jean-Claude Juncker as European Commission president is a "very good sign" for Europe's ability to act, German Chancellor Angela Merkel said, after a meeting with leaders of south east European countries in Croatia.
Ms Merkel added: "I would like to congratulate Jean-Claude Juncker on his election as EU president with a clear result in the first round of voting [...] It will inspire us to resume the work with the European commission."
Jean-Claude Juncker denied being a federalist after being elected as European Commission President.
Mr Juncker told ITV News Political Correspondent Carl Dinnen that he did not want a "United States of Europe". He added: "I will negotiate with David Cameron and others, and will make a fair deal with him".
New Foreign Secretary Philip Hammond has insisted he will not be "threatening" other EU states as the UK seeks to renegotiate its position in the bloc.
Mr Hammond is seen as a more eurosceptic voice than his predecessor, William Hague.
"I'm going to focus on making sure that we have a successful renegotiation with our European partners," he said.
"I don't think the way to enter a negotiation is to start issuing threats."
Jean-Claude Juncker has been elected as European Commission President.
The European Parliament voted for him to replace Jose Manuel Barroso as head of the EC.
Nigel Farage has called incoming European Commission chief Jean-Claude Juncker the ultimate Brussels insider'.
ITV News Political Correspondent Carl Dinnen has tweeted during a meeting with the European Parliament:
Farage to Juncker 'You are a sociable cove with a very much better sense of humour than most people I've met in Brussels.'
But Mr Farage says Mr Juncker is the ultimate Brussels insider. Juncker looks on arms crossed.
Farage has to laugh as Juncker says at least secret ballot will hide the fact that the UKIP leader voted for him.
Jean-Claude Juncker has said he would work towards the introduction of a minimum social wage in each member state of the European Union.
The Designated European Commission President has been addressing European Parliament before a vote on his nomination to replace Jose Manuel Barroso as head of the European Commission.
Juncker previously said he favours each EU country setting a minimum wage as a proportion of its own median income, which varies enormously between Luxenbourg at the top and Romania and Bulgaria at the bottom.
The European Parliament is to vote on Jean-Claude Juncker's nomination to replace Jose Manuel Barroso as head of the European Commission.
Juncker needs an absolute majority of 376 votes in the 751 seat Parliament to get the job.
The vote has been brought forward by a day to allow enough time before EU leaders meet in Brussels to decide on a package of other top EU jobs.
The European Union said it is "in contact with the parties in the [Middle East] region" to press for an immediate ceasefire in Gaza, Reuters reports.
The death toll in the week-long crisis has risen with at least 172 Palestinians killed, according to reports.