GEORGE Kerevan has warned the SNP leadership their currency plan could “unravel” during the next indyref campaign.

The former MP, one of the leaders of an unsuccessful grassroots rebellion on the subject at the party conference, says the Yes campaign risks “drowning in ambiguity”.

During the debate on Saturday, he called for the scrapping of the SNP’s key condition for introducing a new currency in an independent Scotland – that six economic tests set out by the Growth Commission be passed.

Delegates backed the leadership, comprehensively defeating all but one of the amendments, with members voting 781 votes to 729 to mandate the SNP government of an independent Scotland to replace the pound “as soon as practicable”.

READ MORE: George Kerevan: SNP currency policy risks unravelling in the midst of the independence campaign

Following the vote, the First Minister, who did not speak during the debate but sat on the conference stage throughout the session, welcomed the result, and did not appear concerned about the passing of the amendment.

She tweeted: “Great debate at #SNP19 on economy and currency. Amendment urges progress as quickly as practicable, and six tests to ensure solid foundation for decision are endorsed.

“We can move forward now with confidence to make the case for Scotland’s future in Scotland’s hands.”

Writing in The National today, Kerevan says there had been a lack of real debate, and says “no supporter of the leadership motion actually responded to any of the technical points raised against sterlingisation; or attempted to justify economically the six tests.”

“This lack of dialogue will come back to haunt the party,” he warns. “My central concern over sterlingisation remains that – far from being a pragmatic policy bridge to the unconverted – it will unravel smack in the midst of any referendum debate.

“Sterlingisation means you don’t have a lender of last resort to bail out your banks if there is a financial crisis (think Greece).

“That will be the daily headline during indyref2. If we are now committed – as we are – to a new currency, let’s be bold and implement it, or drown in ambiguity.”