c1 Refereed Journal Article, John Orbell signed vuir pt.18/10/11. Not checked in Sherpa, 03/11/11 RD. White in Sherpa, for pre-print archiving status unclear, author can archive post-print (ie final draft post-refereeing), subject to Restrictions: 90 days after publication. e-mail sent to Stephen 14.11.11-MMM. consulting Lyn re: files and version? e-mial sent to Lyn 17.2.12-MMM. Lyn suggested to e-mail Stephen 16.3.12-MMM. e-mailed author 20.3.12-MMM. Stephen's response with version 20.3.12-MMM. e-mail authors re: unable to insert figures as requested 10.5.12-MMM. Stephen responded to add doc that has figues at end of doc. 11.5.12-MMM. Supporting documentation added to dark upload - HD 23/10/17