More than 200 Scottish business leaders have backed independence in an open letter. They say "it will encourage a culture in which innovation, endeavour and enterprise are nurtured."

Yesterday a similar letter was published - only it was signed by 130 people who do not think the business case for an independent Scotland has been made.

It comes as the British Prime Minister David Cameron is to address the business organisation CBI Scotland annual dinner in Glasgow tonight.

Mr Cameron is expected to say that UK trade supports one million Scottish jobs as he argues against an independent Scotland.

He will use the trip north to make the case for Scotland remaining in the UK by hailing long-standing trade ties.

"Scotland does twice as much trade with the rest of the UK than with the rest of the world put together...trade that helps to support one million Scottish jobs," Mr Cameron is expected to say.

"For some industries, the proportion of trade with the rest of the UK is even higher - 90% of Scottish financial services' customers are in England, Wales and Northern Ireland."

"Then there's the world-famous gaming industry, cutting-edge sub-sea technology and life-saving biomedicine - all selling far more outside Scotland than inside."

Mr Cameron's comments come with just three weeks to go until the independence referendum there.

Scottish First Minister Alex Salmond has challenged Mr Cameron to use his visit to explain what extra powers would come to Scotland if a No vote is successful.

"As we approach September 18, people and business leaders are waking up to the opportunities of independence. With full control over economic powers, we have the opportunity to tailor economic policy to our needs, which means a jobs policy that puts the interests of Scotland first," he said.