WESTMINSTER MPs and Holyrood are now at war over the right of the Scottish Government to call an independence referendum, with MPs demanding the final say on arrangements.

The Commons Scottish Affairs Committee, chaired by MP Ian Davidson, claims in a report today that the "overwhelming weight of evidence" shows that the Scottish Parliament cannot presently legislate to hold a referendum on separation.

The report also demands any final arrangements for a referendum should be subject to a triple lock by Westminster – approval through a Section 30 notice, then scrutiny by the Scottish Affairs Committee, before final "approval by Scotland's MPs".

A spokesman for Government Strategy Secretary Bruce Crawford MSP was dismissive of the report. He said: "This exercise is devoid of credibility.

"We set out the position about the right and ability of the Scottish Parliament to hold an independence referendum in our January consultation paper.

"We have also always said that we have absolutely no objection to a Section 30 Order in regard to the referendum, so long as no Westminster strings are attached, and an order on that basis could be agreed very shortly.

"The real issue is that the terms and timing of the referendum must be decided in Scotland, by the Scottish Parliament – not dictated by Westminster – and that includes a possible 'more powers' option."

The report insists agreement should be reached between Holyrood and Westminster to create the necessary legal powers, otherwise Scotland risks "indefinite legal and political wrangling and uncertainty over its future".

Mr Davidson said: "It is clear from our evidence the Scottish Parliament has no powers to hold a binding or an advisory referendum on constitutional change. It is also clear any attempt to do so would result in legal disputes and delay."