THE House of Lords have been told to delay progress of the Scotland Bill by a senior committee of peers, who say the permanence of the Scottish Parliament risks undermining parliamentary sovereignty.

It is the second Lords committee to recommend delaying the bill in the space of a week.

Speaking ahead of today’s debate in the upper chamber on the Scotland Bill, Lord Lang, chairman of the House of Lords Constitution Committee, said there were too many unknowns in the “significant constitutional implications” of the bill.

A spokesperson for Deputy First Minister John Swinney said the permanence of the Scottish Parliament was part of the Vow, and that it would now be up to MSPs to properly scrutinise the Scotland Bill and the fiscal framework.

Launching his committee’s report into the bill, Lang said: “We are concerned that the House is being asked to debate and scrutinise the bill without the necessary information. The bill creates serious risks of future disputes and instability. The House should consider whether to delay progress of the bill until a new Memorandum of Understanding is published setting out how the UK and Scottish governments will work together to manage areas of shared and concurrent powers, and how they will resolve disputes between their administrations.”

Lang, who served as John Major’s secretary of state for Scotland between 1990 and 1995, said: “The Scotland Bill also states the permanence of the Scottish Parliament and Government in law for the first time, while setting in statute the Sewel Convention.

“These measures seem designed to limit Parliament’s competence to legislate. The concept of parliamentary sovereignty is a fundamental principle of the United Kingdom’s constitution. Seeking to limit future parliaments in this way undermines that principle.

“In particular, the hasty decision, taken in advance by the leaders of the three main political parties, to implement the recommendations of the Smith Commission appears to have pre-empted any possibility of meaningful discussion on the merits of the proposals contained in the bill. The political parties are constrained by the Vow and by the continuing absence of much still -unpublished information that is need for proper debate. Parliament is therefore still unable to debate meaningfully the merits of the proposals.”

The committee’s report echoes calls from the House of Lords’ economic affairs committee released last week. That too recommended delaying the committee stage of the Scotland Bill until the fiscal framework – the understanding between Whitehall and St Andrew’s House on the financial matters underpinning the new powers – is made public.

The committee also said the Lords believed that a Memorandum of Understanding currently being negotiated between the three devolved administrations and the UK Government should be published before the Scotland Bill progresses further. The report warned that new powers allowing the Scottish Parliament to change the rules might not be workable with the European Convention on Human Rights unless Scotland grants prisoners the right to vote.

A spokesperson for John Swinney: “The three main Westminster parties made a solemn Vow to the people of Scotland on the eve of the referendum, and it is imperative that the UK Government delivers on the full package of powers recommended in the Smith Agreement.

“It was disappointing that so little time was allotted by the UK Government for the third reading of the Scotland Bill in the House of Commons, but the Scottish Government has already made clear that MSPs will have the chance to scrutinise the fiscal framework.

“Ultimately, the key vote that matters will be in the Scottish Parliament – not in the unelected House of Lords – and we will never support anything which sells Scotland short.”