FIRST Minister Alex Salmond is promoting a "more powers" referendum option in a secret operation to ensure a second question appears on the ballot paper, The Herald can reveal.

Private correspondence obtained by The Herald shows Mr Salmond's office has been helping campaigners wanting to widen the referendum to build the case for putting "devo max" to voters in the poll.

Evidence of the First Minister's active involvement in moves for second question last night angered political opponents and will dismay many within the SNP, who favour a straightforward Yes/No vote on leaving the UK.

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