Today (1 February), at 12.30pm, the Welfare Reform Bill will return to the House of Commons after a series of defeats in the Lords. Let's be very clear - it is a dangerous, incomplete bill based on flawed evidence and unpleasant ideals. It is vast and impenetrable - most of the ministers arguing for it have very little understanding of the detail within it. Yes, that's right, they don't understand the details or effects of their own policies.