This thesis is under embargo for 24 months from 2/11/14 --MA 9/12/14. Embargo's expired, full-text added 29/11/16. Julie White (11 Dec.) sent out an alert and was forwarded from Frances to IRCS 12 Dec -- "This is one of the works we discussed at our meeting on 8th November that needs to remain under embargo." Therefore, full-text has been removed -- MA 12/12/16.  Thesis added to dark upload 4/9/19 Lyn  Correspondence with Helen Borland added to dark upload Lyn 12/12/2020