Tommy Sheppard: Independence poll's biggest finding should concern all who back Yes / Tommy Sheppard: Talking about second chambers won't win us independence / Tommy Sheppard: Shift tax focus from income to wealth if we want to see real change / Tommy Sheppard: Here's how we get the 'indy abstainers' out to vote / Tommy Sheppard: It's no wonder that so many young people have mental health issues / Tommy Sheppard: Westminster has prevented scrutiny of royal finances for too long / Tommy Sheppard: List votes are what really decide the make-up of Holyrood / Tommy Sheppard: Aid cut and calls to up UK defence spending by Labour warrant fury / Tommy Sheppard: Proposed SNP rule change isn't a plot but it is wrong / Tommy Sheppard: A rule change must give members more say at SNP conference