Clifford, Richard Purdie2008-10-222008-10-221970D10385/74http://hdl.handle.net/10399/1931Not currently available online. A paper copy may be available – please contact the Library for help.enAll items in ROS are protected by the Creative Commons copyright license (http://creativecommons.org/licenses/by-nc-nd/2.5/scotland/), with all rights reserved.thesis