This will be interesting. Looks like only a small number however it forms an alternative and it will sharpen the mind of May and Corbyn. Far too much focus on placating the leavers in both parties. If it caries on then brexit is only going to get worse and the remainers will continue to agitate, without concessions and a softening of brexit, they have an ultimate sanction in that they can jump and have something to jump to.
For many MPs the prospect of fighting a GE without the backing of a big party machine is not good - however if brexit turns out to be as bad as all signs indicate then fighting the next GE worth that hanging over it will be a unique circumstance.
Tories will face the blame for brexit but then there voters are the leaset likely to care. Labour will face the heat for not opposing it and what stance they will adopt is a mystery, we will either be out in which case do they campaign to rejoin, the members will want to but Corbyn and his cult will want to stay out, or we will still be in in which case members will want to remain in permanently where as Corbyn will want to