THE SNP’s independence prospectus was “lacking on business and economics” and voters didn’t believe it was affordable, the head of the main business group for Yes has said.

Gordon MacIntyre-Kemp, the founder and chief executive of Business for Scotland, criticised the SNP’s White Paper at the Scottish Green party conference yesterday.

Hosting an impromptu session on Brexit, Mr MacIntyre-Kemp attacked the 2013 document, saying: “The White Paper last time was lacking on business and economics. It was lacking on the environment. It was lacking on so many things.

“It was really strong on health and social care, but then everybody thought, ‘Well, great, but there’s nothing in there that says we can afford this’.”

Mr MacIntyre-Kemp also warned Brexit could knock £7bn off Scottish GDP and queried the impartiality of the country’s leading independent economic thinktank, calling the Fraser of Allander Institute “no friend of Scottish independence” and “pro-Union”.

An SNP and Green voter, he predicted UK Tory majority governments for 30 years.

Scottish Tory MSP Alex Johnstone said: “Considering Mr MacIntyre-Kemp was supposed to be the business brains behind the Yes movement, this is quite an admission.

“It would suggest not only did the No camp realise the White Paper was an ill-thought out pack of lies, but senior figures among the independence campaign did too.

“The Scottish Government treated voters with contempt in publishing the now derided White Paper. It’s time for the SNP to join Mr MacIntyre-Kemp in acknowledging this.”