Clontarf-born McMurtry (74) has a 36pc stake in €2.2bn-valued precision engineering group Renishaw. Shares in the Gloucestershire firm have risen 19pc in the last year, valuing his equity at about €792m. He’s earned about €70m in dividends and fees since 2009.
Renishaw was set up in 1973 when engineer McMurtry left Rolls-Royce to set up on his own. It is now one of the world’s biggest precision measurement equipment makers in the world and works closely with Apple.
McMurtry’s €36m futuristic eco-house in Gloucestershire was used in the finale of the BBC hit drama Sherlock starring Benedict Cumberbatch.
McMurtry’s wife Terry is said to be unenthusiastic about the home — which features 10 floors, an indoor bowling alley and an enclosed winter garden — so they live in a nearby converted barn.