A BBC article: http://www.bbc.co.uk/news/magazine-10965608
Which I think stemmed from this Mintel survey: http://www.ctc.org.uk/DesktopModules/Ar ... &mid=13641
A couple of other takes on the story (with of course The Telegraph taking the more negative slant!)
http://www.guardian.co.uk/environment/b ... oom-survey
http://www.telegraph.co.uk/news/7935114 ... -bike.html