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Only Politicos like us are going to notice, this Parliamentary stuff dosen't have any cut through to Jo Voter.
You think they're going to be let back in?See Diane Abbott. Who was only let back in as a damage limitation exercise durning a General Election campaign.
They are now out of the PLP with no influnce and in some sections seen as an ememy not a friend. Any ability to quitely organise a lobbying campagn to pressure ministers when this comes up in a Welfare Bill, or fiscal statement of some sort, now gone. Not a smart move IMP
Rebelling early gives you an immediate talking point when you'd otherwise be irrelevant.
Doing it now allows you to be brought back in, which both gives a second talking point down the line, as well as more time back in the party before the next election. That way you get max use of the party machine for your re-election.
You're not going to get coverage for just sitting on the sidelines watching the government initiate a general poverty review.