I will get told off if I stay on this, so this is the last post on the prorogatiin matter unless it becomes centre stage later.

In 1948 Parliament was preroged on 25 Octber until 26th Octiber. I.e. There was a 'reset' but apart from a nominal few hours both houses were sitting on the day before and the day after.

Most recently, prerogation was talked about as a mechanism to bring May's deal back again.

In both cases, the intention was to continue the work of the house with no significant gap in the times the houses were sitting.

In the idea being floated is that Parliament was preroged for the precise purpose of stopping it being able to work for some time around the 31 October. It would be days or weeks beforehand, because otherwise the house could attempt to introduce some form of action to amend the decision to leave without a deal. So it is completely opposite to the earlier examples: it is about thwarting the ability of Parliament to act, not enabling it.

Hence Bercow's informal comment that the idea is "for the birds."