I want to thank my wife Karen for all her support and all the time taken from the family life and considering the difficult circumstances in the period before independence, this work would never have been completed without her patient love.

I am deeply indebted to John Kinahan, Jochen Kutzner, Brigitte Lau, David Simon and Christel Stern. I have benefited from many discussions and arguments with them. Klaus Detering and Tove Dix looked closely at English style and grammar in the final version, correcting both and offering suggestions for improvement. Any errors in fact and judgement as well as any omissions are my own.

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