The widow of one of Britain’s most successful entrepreneurs, Tompkins, 74, lives quietly in London. Her late husband, Richard, founded the Green Shield Stamp business in 1958 and made a second fortune from the Argos catalogue shops, which he sold to BAT Industries in 1979 for £32m. He died in 1992, leaving £34.6m in his will, and had overseas assets of £20m. Most of the estate went to his widow. Tompkins has a joint shareholding in a small investment company, Enigmaland, which had net assets of £4m in 2009-10.