Scottish Conservatives deliver their Devo Max plans for a no vote

The Tory plans for Devo Max would mean Scotland would raise 50% of its own revenue. Credit: Press Association

By Debi Edward: Scotland Correspondent.

Many Scots admit to not knowing exactly what Devo Max is yet a majority consistently say it's what they'd vote for in September - if it was on the ballot paper.

Devo Max is a snappy (ish) way of describing further devolution (more powers for the Scottish Parliament) and in polls it proves more popular that a Yes vote or a vote for status quo.

Today to the Scottish Conservatives delivered their Devo Max plans, describing them as a "radical vision" for Scotland. It completed a trio of offerings from the three main Unionist Parties.

In actual fact the most radical of the Devo Max proposals on the table are from the Liberal Democrats.

They would like to see Holyrood get control over income tax, inheritance tax, capital gains tax, basically something akin to a federal state. That would see Scotland raising 50% of its own revenue, compared to 15% at present.

Scottish Labour meanwhile have pledged to include in their manifesto for next years General Election a commitment which would Scotland to raise 40% of its revenue through the variation of income tax rates and the devolution of welfare benefits, namely the housing benefit.

However their plans have been rounded on by critics for being half-hearted, with some claiming that varying income tax by 15p in the pound would only lead to Scotland generating around 25% of its own money.

More: Gordon Brown throws his weight behind the No campaign

And so today to the Conservatives who said they were promising ''something special''.

That something special is full power over income tax rates and the devolution of housing benefit and the attendance allowance. Scottish Leader Ruth Davidson MSP said:

The country would be responsible for 40% of its revenue.

The Conservatives may be the last to the Devo Max party but they appear the ones most likely to have the keys to number ten following next years General Election and therefore most likely to be able to follow through on these pledges.

In the event of a NO vote that is.

The SNP have been quick to dismiss the above as a 'bidding war' by the Unionist parties and one which only furthers their case for independence. Deputy Leader Nicola Sturgeon said

More: Nicola Sturgeon: Choice for Scotland is crystal clear

We are approaching 100 days to go until Scots answer the question ''Should Scotland be an independent country?''.

But are voters any the wiser about what's on offer in the event of a No vote? Will the Devo Max offerings make a difference?

What is becoming clear is that this debate is full of uncertainties and when Scots do go to the polls on September the 18th they will be weighing up what they think is the most likely, and appealing, from a growing host of theoretical scenarios