Parliamentary Voting System and Constituencies Bill

My Lords, can the noble and learned Lord help the House by explaining the difference between the Bill that we are due to consider today and, say, the Scotland Bill that was introduced in 1998? That Bill, which was brought in by the previous Government and provided for the creation of the Scottish Parliament, also contained measures to change the boundaries of constituencies in Scotland, and in particular to create separate constituencies for Orkney and the Shetland Islands. That Bill, introduced by a Labour Government, was never considered to be hybrid. Can he explain why this Bill should be?