c1 Refereed Journal Article LL 3/10/13. Not checked in Sherpa MA 3/10/13.  Green in Sherpa:  author can archive pre-print (ie pre-refereeing), author can archive post-print (ie final draft post-refereeing), author cannot archive publisher's version/PDF, Requested (Stephen) Post-Print & Permission, 18.11.13-MMM. Both received, 21.11.13-MMM. Supporting documentation added to dark upload - HD 13/11/17