... necessary", just the existing laws and conventions.
The first day the Commons sits after the summer recess is Tuesday, 3rd Sept. Corbyn can then request a vote of no confidence on Wed 4th. If that's won, then the Fixed Term Parliament Act says there are 14 days, starting the following day, to get a different government through a confidence vote in the Commons. That takes us to the end of Wednesday 18th. The act says parliament must dissolve on the 25th working day before the ensuing election.
Our elections are, by convention, on Thursdays; the last one before the Brexit date is the 24th Oct (and even that invites chaos - a government has to be formed, probably as a coalition which needs days of negotiation, and then that government has to agree with the rest of the EU that Brexit won't happen on the 31st). That means parliament must dissolve at one minute past midnight on Thursday 19th Sept. But the Act says the PM has to advise the monarch on the date for the election; and then will have to come back to parliament to say when the election is, and thus when it will dissolve. But it's too late for that.
What we will need is to either form a government from the opposition parties and rebel Tories with the confidence of the Commons in those 14 days (unprecedented), or to take complete control of the legislative process and draw up and pass a law (including all stages in the Commons and Lords) to stop Brexit (again, with support of all opposition parties and sufficient rebel Tories- unprecedented).
It's us who need "any means necessary", not Cummings. We didn't check the calendar in time. Even when Swinson asked Corbyn to put down a motion of no confidence before the recess started, he refused. There should have been public knowledge of what that meant, and pressure on him to do it.
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