Instead, he worked his way up from messenger boy at the J. Walter Thompson advertising agency. While he was a copywriter there, he had a thriller screenplay accepted and shot by BBC TV - Valid for Single Journey Only (1955).
Instead of starting from the bottom, he worked his way up from being a messenger boy at the J. Walter Thompson advertising agency to become a copywriter. It was as a copywriter that he wrote a thriller screenplay, which was produced by BBC TV - Valid for Single Journey Only (1955).