In any other line of work, if you were appointed because you agreed to endorse certain policies and argue for particular benefits, if you decided not to carry out the employers policies and didn't argue for the benefits outlined by the employer, because you didn't like his regime, the sack would follow.
Much as I admire Labour defectors reacting to Labour leadership and the state of the party, they have effectively removed themselves by vacating the premises in which they work to go and join people who agree with them elsewhere. They say they will not return to the workplace or the job they were appointed to do..
In that case, why are they still being paid? 
I'd have relished such flexible terms when I worked! 