Parliamentary Voting System and Constituencies Bill

The Deputy Leader of the House told us that the figure of 600 was arbitrary. He has still not explained why an arbitrary figure has to be fixed in statute in perpetuity. If this is about creating equality between the component parts of the UK, why does the Bill say that constituencies in Northern Ireland can vary more widely, both among themselves and in comparison with constituencies elsewhere, than those anywhere else? That does not achieve what he says the Bill is supposed to achieve.