Take 5
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I have already sat my inital exams and have my interview in Feb

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As part of the interview letter a list of recommended reading is given which lists 5 books.
Of this list the two books worth reading are:
Graham Duke - Air Traffic Control
David Graves - UK Air Traffic Control (A laymans guide)
These are the most current ones and basically contain the same information as other publications.
However, if you are sitting the initial tests then I would say its not necessary to read these.(I know I didnt) Just learn everything that is listed in the booklets that have been sent to you