Originally an idea put forward by Ramsay MacDonald, not a great thinker and not a good man or Prime Minister, but everyone can have one good idea.
Back then the Soviet Union was very in vogue, and the idea was based on the Grand Soviet, MacDonald wanted the Lords reconstituted as representatives of Trades Unions, as they are in the Labour Party itself. That’s too party political, but if only those Trade Unions not affiliated with a political party were included, and if you added other charitable and mutual organisations it could be workable. RSPB. Skipton Building Society. Co-operative Bank. Howard League for Penal Reform. Marylebone Cricket Club. Royal British Legion. Certainly an improvement on the fools appointed by HMG for services to the arms trade and suchlike things. It’s meant to be a consultative assembly, it would be nice to have some experts in there instead of the most corrupt and unpalatable elements of society.
The flaw in most ideas about Lords reform is that it would make the Lord more legitimate and democratic, while the entire English political system is based on only the Commons having any claim to democratic legitimacy. Making the Lords elected by PR or something like that would be an awful idea. It’s better to keep them powerless and “deliberative”, but with a more respectable element than is currently there. Representatives of the civil society and the like.