category c1 Refereed Journal Article. 22.11.13 kq. Yellow in Sherpa: author can archive pre-print (ie pre-refereeing),  subject to Restrictions below, author can archive post-print (ie final draft post-refereeing) Restrictions: 18 months embargo, author cannot archive publisher's version/PDF, author initiated, Neil Hooley has signed Permission form, emailed Neil letting know about embargo, and requested Post-print to be loaded when embargo expires, 6.12.13-MMM. Supporting documentation added to dark upload - HD 14/11/17