Britain and the EU kick off a third round of Brexit talks Monday as British sterling hit eight-year low against euro.

Sterling sank to 1.081 euros over the weekend, a level not seen since October 2009. Such drop in value of the British currency is believed to be a result of uncertainty surrounding the divorce agreement between the U.K. and the EU.

Before the Brexit referendum, sterling stood at over 1.31 euros, but has lost nearly 17 percent in value since then, with a decrease by 9 percent since April. Despite continuous ups and downs, analysts continue to doubt that euro-sterling parity will be reached.

Analysts also said that Brexit was not the only reason for the shrinking difference between the British and European currencies, pointing to the euro's surge as a result of rapid economic growth within the monetary union.

During the upcoming talks London was impatient to agree its future relationship with the bloc while Brussels insists the divorce settlement comes first.

The European Union's chief negotiator Michel Barnier will meet his British counterpart David Davis late afternoon in Brussels for a first exchange, followed by three days of discussions and a joint press conference.

The EU says there has to be "sufficient progress" in three key areas – EU citizen rights, Northern Ireland's border and the exit bill – before it can consider London's demand for talks on future ties in October.

Britain says it would be best to negotiate the two in parallel and that settling trade issues may even help with other problems such as the future EU-UK border between Northern Ireland and the Republic.

That is a complete no-go for Brussels which made no secret of the fact that it expects little progress in bridging what officials last week called a "very big gap."

They also blamed Britain for a "lack of substance" despite a flurry of position papers they said were strong on aspiration but short on detail.

Barnier last week listed on Twitter the EU's own negotiating documents, noting: "EU positions clear and transparent since day one."

Davis said Monday the British papers were "products of the hard work and detailed thinking that has been going on behind the scenes and should form the basis of what I hope will be a constructive week of talks."

"We're ready to roll up our sleeves and get down to work once more," he added.

Both sides have repeatedly warned that the clock is ticking down to the March 2019 Brexit deadline and that they are the ones doing their best to make progress.

The situation is complicated by sharp divisions within Prime Minister Theresa May's Conservative government after a June election gamble backfired and she lost her parliamentary majority.

May remains in office thanks to a deal with Northern Ireland's ultra-conservative Democratic Unionist Party which views the Republic with deep suspicion.

EU officials warned last week that the hard-won Northern Ireland peace process could not be used as a bargaining chip.

As for London's suggestion that technology could help prevent the border becoming a barrier to trade and the peace process, that was just "a lot of magical thinking," one EU official said.

In another position paper, Britain said the European Court of Justice might continue to have an indirect influence, softening its position that the EU's top court would not have any say in the country at all.

But again this was not enough, EU officials said.

The rights of more than three million EU citizens in Britain and one million Britons in Europe arose from EU law which is the remit of the ECJ, they added.

"There is no other possibility," one official said.

As for Britain's divorce settlement – estimated at up to 100 billion euros in Brussels but much less at 40 billion according to reports in London – the EU officials said the talks were not about fixing a number but about agreeing how to work out the bill.

"We have to have a methodology sufficiently detailed so that commitments made to various beneficiaries of the EU budget will be honored," one of the EU officials said.

In what the European Commission insisted was "absolutely nothing extraordinary," former British premier Tony Blair is due to meet Commission head Jean-Claude Juncker on Thursday as the Brexit talks wind up.

The British press made much of the visit as Blair is staunchly pro-EU and anti-Brexit, and has campaigned for a second referendum in the hope of reversing the June 2016 outcome.