While the powers of the executive were being reduced the power of parliament would be increased by improving the procedures for parliamentary scrutiny of government bills and the opportunities for debate. (newlawjournal.co.uk)
It is true that private member's bills do not always get the same level of scrutiny as government bills before they are introduced. (slaw.ca)
In theory, the second party could be in total, public, opposition to any other government bill. (politics.stackexchange.com)