With a public groundswell in favour of removing the archaic partial defence of provocation from the books, the opposition is planning to put the government on the spot by seeking leave to introduce their member's bill on the issue. But it looks like the government will pre-empt them. Good - a government bill means it will likely happen faster, and avoid taking up valuable space on the member's section of the Order Paper. And it doesn't matter who gets the credit, provided it gets done.
Update: The government has just denied leave for Dalziel to introduce her bill. This may mean a quicker repeal in the long run, but it looks pretty petty.