Stevenson was a non-executive Director of British Technology Group (1979–89), Tyne Tees Television (1982–87), Manpower Inc. (1988-2006), Thames Television (1991-93), J. Rothschild Assurance plc (1991–97), English Partnerships (1993-2004), BSkyB (1994-2001), Lazard Bros (1997-2002) and St James's Place Capital (1997-2002).
Under the privatization policy of Margaret Thatcher the National Enterprise Board was merged into the British Technology Group and had to sell its shares in Inmos.
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