\section*{Acknowlegments}

I would like to acknowledge my supervisors, Prof Tim French and Dr Rowan Davies for their support and feedback during this project. I would also like to thank my colleague David Gow for his contributions to the joint part of the project. Lastly, as a double degree student I need to express a double degree of thanks to my friends and family for their continued patience whilst I completed my second ``final year'' project in what is technically a penultimate year.

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