Author initiated. Yellow in Sherpa; Author's Pre-print: author can archive pre-print (ie pre-refereeing)  Author's Post-print: subject to Restrictions below, author can archive post-print (ie final draft post-refereeing)  Restrictions: 12 months embargo  Publisher's Version/PDF: author cannot archive publisher's version/PDF  -MA 18/12/13. Requested (Simon) Accepted version & permission, Jan 2014. Simon's response: articles written at previous work, does not have copies or drafts, 15.1.14-MMM