The Security Service is, of course, an organization much of whose work must remain secret. This is to protect those who share information with us and ensure that they and others will have the confidence to do so in the future, and to prevent those who seek to harm this country and its people from gaining information which might help them carry out their plans. Writing a history for publication which covers the work of the Service up to the present day is, therefore, a considerable challenge and one which I do not believe that any other major intelligence or security service anywhere in the
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