Clough has written several books and articles dealing with phreakers, hackers and computer virus writers; credit card fraud; banking; and the activities of MI5 during World War II, specifically the Tyler Kent–Anna Wolkoff Affair (2005).
In 1990, Clough and Paul Mungo, a journalist, wrote Approaching Zero (1992) a book that covered the activities of phreakers, hackers and computer virus writers.
Clough's book State Secrets: The Kent–Wolkoff Affair (2005) took advantage of privileged access to Government files and also the release of others under the Freedom of Information Act.
Sixty-five years after the event, Clough finally revealed the 'real reason' for Kent's arrest and imprisonment – which was very different from the earlier versions in officially inspired publications.
He then worked in a variety of industries, mainly in engineering, before becoming chief executive for a major international company which allowed him to travel widely.