LONDON - Britain's government published a draft law Thursday on handing more powers to Scotland including greater control on tax and welfare after the country rejected independence in a referendum last year. PM David Cameron said the move would make the Scottish Parliament "one of the most powerful devolved parliaments in the world".

But Scotland's First Minister Nicola Sturgeon of the Scottish National Party (SNP), who was holding talks with Cameron in Edinburgh later on Thursday, said earlier that the proposals do not go far enough.

The proposals include new powers to set the rates and thresholds for income tax and also would see the Scottish govt receive a larger proportion of tax revenues.

The proposals are part of a package of concessions promised by Britain's political leaders three days before Scotland's independence referendum in September.

"The draft clauses published in this document are the next stage in delivering that commitment," the bill said.

"Our United Kingdom is a success story. And Scotland has played a crucial part in that and will continue to do so," it added.

The process to make them law will only begin after Britain's general election on May 7 which could see dramatic changes in which parties hold Scottish seats in the British parliament in London.

The SNP is expected to make major gains and at least double its tally of six lawmakers.

This could cast the party as power brokers if, as polls suggest, Cameron's Conservatives or the main opposition Labour party fail to win an outright majority.

The nationalists have indicated they could team up with Labour but would use their position to push for more powers for the Scottish Parliament which go beyond the current proposals.