Here is an elegantly written antidote to the 2011 F A Mann lecture delivered by Jonathan Sumption QC who has now taken his seat as a Justice of the Supreme Court - "Judicial and Political Decision-Making: The Uncertain Boundary." (Lord Sumption made the speech after being selected for the Supreme Court but before being sworn in).
I do not propose to gloss in any way Sir Stephen's essay which concludes by saying of Sumption QC's lecture:
See also the earlier Law and Lawyers post - "Judicial Review: Keep out of politics ... but can the judges do so?"
Other links - added 20th February: The UK Constitutional Law Blog has published "Lord Sumption and judicial responsibility" and "What role should judges play in the constitution Lord Sumption?" These articles look at the views of Lord Sumption as expressed in the F A Mann lecture. The first article is by Tom Adams - Law Lecturer St. Hilda's, Oxford and the second is by Stuart Lakin - Law Lecturer, Reading University.