ALEX BELL: SNP needs to let it all out on Scottish independence argument if Indyref2 is to happen

© GettyBritain's Prime Minister Boris Johnson gestures as visits HMS Victorious at HM Naval Base Clyde on July 29, 2019 in Faslane, Scotland.
Britain's Prime Minister Boris Johnson gestures as visits HMS Victorious at HM Naval Base Clyde on July 29, 2019 in Faslane, Scotland.

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