Declaration I …………………………………………………………. Hereby declare: a) That this dissertation is my own original work and that all source material used is acknowledged herein; b) That this has been prepared specifically for a first degree of the University of Newcastle Upon Tyne; and c) That it does not contain any material previously submitted to the examiners of this or any other University. Signed ………………………………… Date …………………………………… 1