Don't miss the point. Irvine or Bercow. Doesn't matter. It is the system that is wrong, that they can all get away with it.
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Irvine aside, what has Bercow done wrong? What has he 'got away with'? He's hardly pocketed the money or moved it into an offshore account, has he?
Those are expenses accrued whilst discharging the duties of Speaker Of The House of Commons, nothing more.