Various articles in the French press have claimed that Boeing, an American aircraft company, was given secret information on Airbus, its European rival, which could have been gathered only by using a system such as Echelon.

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His books have been translated into a total of 33 languages and his articles have appeared in various publications including the Harvard Business Review, the New York Times and Wired.

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Volunteers have been producing up to 20 articles a day in various languages, and Mr Bamkin has been in Gibraltar this week seeking more people to contribute photos, maps and information on the territory's history.

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He has authored or co-authored articles on the valuation of business enterprises and related subjects that have appeared in various business and professional publications, including Harvard Business Review, Business Horizons, Monthly Digest of Tax Articles, Management World, Family Advocate, YPO Enterprise, Chief Executive, and The Business Valuation Handbook.

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