TRUST in Westminster has been "eroded" by the Brexit negotiations, Nicola Sturgeon said.

Clashes over Brexit laws have strained relations between Holyrood and London, the First Minister said.

Holyrood will not give consent to any further Brexit legislation until the "broken" devolution system is fixed.

Ms Sturgeon wants protections written into law that would effectively give the Scottish Government a veto of some of the laws pulling the UK out of the bloc.

Speaking after a meeting of the British-Irish Council in Guernsey, she said: "Our experience in recent weeks and months around the Withdrawal Bill discussions have put a strain on that trust and I think inevitably have eroded it.

"I am certainly very keen to see how we can rebuild it and re-establish it."

But Ms Sturgeon said "respect and consent" must be the basis of working relations.

David Lidington, de facto deputy prime minister, said there had been a "real" disagreement over the Brexit process.

He said: "I'm not going to hide at all from the fact the UK and Scottish governments have had a serious disagreement over the EU (Withdrawal Bill)."

But he said he believed the Sewel Convention, which means Westminster does not normally legislate on devolved matters without Holyrood's approval, had been "upheld in full".

He added: "That disagreement is real, it has happened."

Scotland's Brexit minister Mike Russell said the Scottish Government no longer trusted UK ministers following a breakdown in relations over the handling of the EU Withdrawal Bill.

He added that he "couldn't conceive of circumstances" where MSPs would vote to give approval for further legislation related to leaving the EU, such as trade, agriculture and fisheries.

MPs approved parts of the EU Withdrawal Bill related to devolution after less than 20 minutes of debate last week, despite the Scottish Parliament voting against granting formal consent for the Bill.

Speaking on BBC Radio Scotland's Good Morning Scotland programme, Mr Russell said: "We are absolutely clear that the way that devolution operates and the structures of devolution have failed, and they failed because the UK Government is refusing to operate them.

"For example, on the Sewel Convention, we need to have the interpretation of that written down in statute and made legally binding, because what we've presently got is a situation where the UK Government makes the rules and then breaks them themselves, and there are no sanctions."

He said that, while there was "practical work" to do to prepare for Brexit, "it is very difficult to do that work because, frankly, we don't trust the UK Government with it".

Mr Russell added that he "couldn't conceive of circumstances in which we brought legislative consent motions about Brexit issues to the chamber until we have resolved the issue of the Sewel Convention and the way the parliaments work together. We don't trust that system any longer.

"The ball is very much in their (the UK Government's) court; we have said there are things we cannot now do because they have broken the system.

"They need to look at that and they need to work constructively with us."

Scottish Conservative constitution spokesman Adam Tomkins said: "Like everything the SNP does, this is a calculated tactic which it thinks will bring independence closer.

"The nationalists don't care about making Brexit work for Scotland, or indeed the wellbeing of devolution.

"They simply want to break up Britain, and this is the latest ploy in that process.

"If anyone is proving untrustworthy, it's the SNP government."