When I joined the House of Lords in 2013 I soon realised that, despite its poor reputation, the place contained plenty of wise, quick-witted and courageous minds. None more so than Nigel Lawson who died this week. An intellectual titan who had once almost become a philosophy professor, he was not content to rest on his considerable laurels as a politician and seemed unafraid to challenge any conventional wisdom to check if it deserved that status.