I am extremely grateful to Matthew Purvis, one of the extremely assiduous and analytically astute researchers in the House of Lords Library, who has confirmed with some statistics my suspicion that former MPs and councillors (nominees of their parties, all) are indeed disproportionately represented among the active membership (those who attend and vote) of the Lords.
I am writing with regard to your latest post on Lords of the Blog in which you mention the voting propensity of Members of the Lords who have served as a Member of Parliament or as a local councillor. (http://lordsoftheblog.net/2012/03/12/parliamentary-memory-lane/). By my calculations, in the current session (as at 12 March 2012) Peers who served as an MP/councillor have voted, on average, in 61.18% of divisions compared to 48.26% of the whole House. I would note that those who are former MPs/councillors are more likely to take a political whip in the House of Lords. Voting of peers is explored further in the House of Lords Library Note, Party and Group Strengths and Voting (21 June 2011, LLN 2011/022; http://www.parliament.uk/briefing-papers/LLN-2011-022).
The figures above do not take account, of course, of the various current and former MSPs, AMs, MLAs and MEPs who sit here. It seems election is far from inimical to members of the Lords, even while it remains strangely controversial as a method of gaining a seat there! Do also have a look at Matthew’s excellent and interesting research on regional representation in the Lords. It shows that of those English Peers who publicly disclose an address (506 in all), 54% are from London or the South East, with only about 3% from the North East. http://www.parliament.uk/briefing-papers/LLN-2012-007