BREXIT talks could stall for months unless the UK agrees to meet its financial commitments, the EU’s chief negotiator has said.

As the latest round of talks draws to a close, Michel Barnier said the “constructive week” had failed to bring the progress needed to drive the process forwards.

His comments came as a report by the House of Lords warned that Westminster should bring new legislation to ensure Holyrood and other devolved parliaments retain authority over powers transferring back from Brussels.

The Scottish Government has published a list of more than 100 areas under its competency over which it claims London is trying to take control in a post-Brexit “power grab”, including in areas such as farming and fishing.

And, as the complex wrangles continue, a senior Dutch politician has warned that the UK is “daydreaming”. Foreign Minister Bert Koenders said: “I don’t think I’m the only one worried about the lack of realism we see on the British side.”

He told reporters in The Hague: “The clock is ticking. Big Ben may be still for renovation, but in Europe time ticks on.”

Barnier said Theresa May’s speech in Florence last week had created a “new dynamic”, but said UK Brexit Secretary David Davis had not set out details on which financial commitments the UK would meet.

Speaking in Brussels, he told reporters: “The UK explained also that it was not in a position yet to identify its commitments taken during membership.

“For the EU, the only way to reach sufficient progress is that all commitments taken at 28 [member states] are honoured at 28.

“We have had a constructive week, yes, but we are not yet there in terms of achieving sufficient progress. Further work is needed in coming weeks and coming months.”

For his part, Davis insisted “decisive steps forward” had been taken, particularly on the future of EU citizens in the UK.

Barnier said the British team had confirmed that this group will be able “to invoke their rights before the UK courts”, but the role of the European Court of Justice in securing those rights has still not been determined – something the diplomat called “a stumbling block”.

Davis had hoped to progress to discussions on future trade relations with the bloc when EU leaders meet again next month. But the EU side wants more progress on financial payments, citizens’ rights and the Ireland-Northern Ireland border first.

However, Davis emphasised the importance of the week’s talks, saying: “This round was a vital one.”

In a joint statement, business group CBI and the TUC union body shared frustration about the slow pace and its impact on the public, saying: “After 15 months of human poker, the uncertainty facing four million European and UK citizens has become intolerable. A clear guarantee of the right to remain for citizens in both the UK and EU27 is needed within weeks.”

Labour shadow Brexit secretary Keir Starmer warned the October deadline for concluding the first phase of negotiations will probably be missed, saying: “This poses a real risk to the British economy and continuing uncertainty for EU and UK citizens. Both sides need urgently to work towards a breakthrough that can move discussions on.”

Meanwhile, the third report from the Lords’ Delegated Powers and Regulatory Reform Committee warns the Brexit repeal bill “gives excessively wide law-making powers to ministers, allowing them to make major changes beyond what is necessary to ensure UK law works properly when the UK leaves the EU”.

The committee concluded the so-called Henry VIII powers in the bill are “unacceptably wide” and without changes will mean “insufficient parliamentary scrutiny” of many law-making powers, including the setting of an exit date.

The report says parliament must be given a greater say, adding: “The government should bring forward separate bills to confer on the devolved institutions competencies repatriated from the EU.

“It is inappropriate for an issue of such constitutional importance to be left to secondary legislation.”

SNP Europe spokesperson Stephen Gethins told The National: “It is clear that when Theresa May said she was taking back control, she meant from Edinburgh, Cardiff and Belfast as well as Brussels. Even the House of Lords has now recognised the flaws in the UK Government’s plan. This is the biggest power grab since the Scottish Parliament was reestablished.”