There might well be some Tories who might break ranks and vote for that, but I doubt if there woud be enough. And I suspect that there'd be some mechanism by which the government could defy it anyway - the police request might not have any legal force, but it could and would be claimed that it did, and that would be a way of kicking it all into the long grass.   

They could always get the tame Attorney General to say the the police request had force, and they could rustle up some legal experts who could say the same.