Is that a convention though? The word supposition doesn't exist in Erskine May but perhaps a similar one does?It's a side note in the margin to a deal we do not have , its not valid at all unless the deal is voted through , its delay for the sake of delay .
Convention is - sorry we cannot vote on supposition .
I'm surprised you haven't picked up on Bogdanor's Telegraph piece yet. That has real references. I haven't seen much proper legal debate on it yet though. I imagine the Attorney General will have had his orders from Dom to have a good look at it.