Gordon Brown is a big fan of this one. Desperate as ever to keep his nation (Scotland) inside a big UK pond where he can feel part of the dizzy world of international statecraft, rather than see himself relegated to a has-been in a smallish European nation with a less illustrious history, GB is perpetually looking for ways to hoodwink the Scots into voting for the Union. This "Nations and Regions" trope is a big one in this context. He has gone public with his latest re-packaging of it, selling it under the guise of a H of L reform; cynicism in action.
What's wrong with it?
As with any all-elected H of L replacement this approach would founder on the difficulty of attracting hundreds of honest, empathetic, experienced and impressive citizens ready to do their duty for a term or two. It would be utterly dominated by political parties, as is the House of Commons. It would be pale, stale and feeble.
Even worse, this idea meets immediately with hostility from English voters. It is a slap in the face to those who already feel aggrieved that England has not been given home rule whilst other nations have. The arguments over whether this feeling is justified can rage freely and the conclusion is not really important; the issue is that the feeling exists, powerfully and near-universally. The suggestion that England is not a nation but a bunch of regions is a red rag to the bull of English nationalism.
Instead, I suggest an appointed house with appointments made by co-opted bodies taken from civil society, the professions and other bodies.