He started Arnold Broadcast in 1997, dealing with crisis communications, media training, and corporate video productions. One of Arnold's clients was the Port of London, where he advised the authority on the media implications of the government inquiry into the Marchioness disaster. He also advised the education department of the former Soviet republic of Georgia on how to deal with a free press after the fall of communism and has trained British Council staff in London, Africa, South America and the countries of the former Soviet Union.