During a rally in Westminster on Thursday against the government's Education Bill, the left-wing Labour MP John McDonnell said the government would become a de facto coalition with the Tories if it relied on their support to pass the legislation. He then said that if that happened the government would forefeit any right to his support.
The implication of this statement is that McDonnell (and possibly other left wing Labour MPs) would resign the Labour whip in the event of government relying on Tory support to pass it's education reform. I think that this would be a good idea. If a group of Labour MPs were working together to represent the real concerns of the labour movement then it would put the union leaders on the spot for continuing to support a clearly anti-working class government when there is a better alternative on offer.
Of course, it remains to be seen wether or not McDonnell and his comrades will actually do this but if they do I will back them to the hilt.