However bear in mind that because the bill started in the Lords the government cannot use the Parliament Acts to force its passage, and if the lords stick to thier guns (and risk a constitutional crisis) the only way for the govt to force the bill through in their terms will be to withdraw it and re-start it in the Commons, so disrputing thier legislative timetable.

Why would the Lords not stick to their guns? They have honestly debated, voted on and passed these amendments, are they to be asked to now vote against them?