Plans for a radical transfer of power from Westminster to Holyrood have been signed, sealed and delivered, Ed Miliband has insisted.

The Labour leader visited Glasgow the day after a new set of proposals on extending devolution was unveiled.

He pledged to put these into law in his first programme of government if he becomes Prime Minister next May.

Mr Miliband hailed the package, which has been put forward by the Smith Commission on devolution, as a "radical transfer of powers that puts the Scottish Parliament as one of the most powerful parliaments of its kind in the world".

He told party activists: "Elect a Labour government in May and we will implement the Smith Commission in our first Queen's Speech. This is my promise to the people of Scotland."

Mr Miliband said Scots had shown in the referendum campaign that they wanted greater control over decisions north of the Border and stronger powers for the Scottish parliament.

He said: "We have listened. We have learned. And we have changed.

"A vow was signed during the referendum campaign. It was sealed by the votes of the Scottish people. It was delivered by the Smith Commission. It has been signed. It has been sealed. It has been delivered."

The Smith Commission had been set up by the UK government immediately after September's ­referendum - in which 45 per cent of voters backed independence.

Days before the historic vote, Mr Miliband, Conservative leader David Cameron and Liberal Democrat leader Nick Clegg jointly vowed Scotland would get substantial new powers if it voted to stay in the UK.

Representatives from the five parties at Holyrood - the SNP, Labour, the Tories, Liberal Democrats and the Greens - worked together to produce the report, which will now form the basis for draft legislation to be published in January.

The leaders of the ­Westminster parties have already pledged that this will be put into law regardless of the outcome of next May's General Election.

New Scottish First ­Minister Nicola Sturgeon has already insisted the recommendations do not go far enough.

Yesterday, Ms Sturgeon said: "We do not think it lives up to the rhetoric that was used by the Westminster parties in the run-up to the referendum."

But Mr Miliband said: "It is the first time anyone has tried to dump a report they signed up to within less than 24 hours?

"I think the SNP's position is an odd position and I think it is important that we say 'We have delivered'.

"After all, this is a more radical position than any of the parties were proposing at the time of the referendum.

"Now we have to get on with the argument of how those powers are going to be used."

Nationalists have highlighted the response from groups such as the Scottish Trades Union Congress and the Child Poverty Action Group in support of their stance that the recommendations could have gone further.

SNP MSP Linda Fabiani, who represented the party on the commission, along with Deputy First Minister John Swinney, said: "Civic Scotland's disappointment with the Smith Commission proposals is clear.

"Many organisations feel that an opportunity to tackle poverty and inequality has been missed."