THE SNP government last night widened its attack over what it claims are watered down plans on more devolution, by telling Westminster to scrap 12 "vetoes" which could stop Holyrood making its own decisions on welfare, energy and transport.

Deputy First Minister John Swinney urged other parties to join his demand for the "dirty dozen"- as the vetoes are termed - to be removed from draft clauses published last week on the back of the Smith Commission report.

First Minister Nicola Sturgeon is expected to repeat the call when she appears on the BBC's Andrew Marr show this morning.

The row coincides with the launch of a nationwide consultation designed to give the public a say over what greater devolution should look like.

The Scottish Campaign for Home Rule says the draft clauses arising from the Smith Commission should be seen as "only the beginning" of the process, and voters now need to make their views felt.

David Cameron visited Edinburgh on Thursday to hail a UK government command paper containing 57 pages of draft clauses he said delivered the pre-referendum Unionist 'vow' of more powers and brought devolution to "the right resting place".

The clauses, which are designed to be enacted in a new Scotland Bill after the general election, are meant to mirror the Smith Commission's plans to give Holyrood new powers over taxes, welfare, borrowing, the Crown Estate and voting.

However the SNP immediately cried foul, saying some clauses gave the UK government a veto over their plans to amend Universal Credit and axe the bedroom tax, a claim flatly denied by Cameron.

Last night, Swinney broadened the criticism by releasing a list of 12 clauses he said required Scottish Ministers to consult the UK government before making decisions, eight of which also required the UK government to give permission.

He said the draft legislation represented a degree of progress, but repeated the complaint that powers recommended by Smith in November had already undergone a "significant watering down".

One of the two SNP MSPs who sat on the Smith Commission, Swinney said it was essential for the vetoes to be removed if the new legislation was ever to deliver on the letter and spirit of Smith.

He said: "It is in the interests of all political parties in Scotland to support the Scottish Government in our call to the UK Government to ensure Smith recommendations are delivered as the Commission intended.

"Scotland should not - and will not - accept anything less, and the people of Scotland deserve all parties in Holyrood to call for the delivery of what was promised to voters.

"The Scottish Government is focused on securing economic growth, tackling inequality and protecting our public services, and the new powers being delivered must help deliver those goals."

The 12 vetoes relate to clauses on universal credit, speed limits, road signs, electoral registration, alleviating fuel poverty and imposing obligations on energy suppliers.

Although some issues are relatively minor compared to new tax and borrowing powers in the clauses, the decision to ramp up the fight shows the SNP will make complaining about being shortchanged by Westminster a key general election issue.

An SNP source added: "This is Westminster's dirty dozen - the gap between what Smith proposed and what the Westminster parties are prepared to deliver. The pretence that this is Home Rule - when Holyrood would even have to consult the UK government about road signs - is laughable.

"The clever thing for Westminster would have been to deliver real Home Rule and satisfy majority opinion in Scotland, but yet again the response is grudging - which guarantees the constitutional debate will continue, and on SNP terms."

A Downing Street source stressed the command paper contained "draft" clauses which could yet change, and said it was only sensible for Edinburgh and London to cooperate on the timing of complex welfare changes to avoid possible confusion.

"That's a reasonable grown up thing to do," the source said.

The idea of improving the clauses is central to the roadshow, website and online consultation launched by the Scottish Campaign for Home Rule to hear the public's preferences for more powers.

Hamira Khan, a member of the campaign's steering commission and chief executive of the Scottish Youth Parliament, said: "The aim is to ensure Scotland's constitutional future is not just a political horse trade between politicians, and the people have their say on what it is and how it is delivered. The Smith Commission and Command Paper are only the beginning of this process.

"The majority of people in Scotland want a fair Home Rule settlement and what was published last week does not represent Home Rule for Scotland."

The roadshow includes public events in Edinburgh, Stirling, Glasgow, Inverness, Dundee and Perth in February and March in collaboration with the Electoral Reform Society, Scottish Council for Voluntary Organisations, the Economic and Social Research Council and the Common Weal thinktank.

Feedback from the consultation is to be published before the general election on May 7.

The campaign's three basic principles are that Holyrood should have the tax and borrowing powers to raise the money it spends; that there should be a presumption in favour of devolving powers and the burden of proof should be on those arguing for powers to remain reserved at Westminster; and a written constitution should underpin mutual respect between the parliaments.