Lamda Development, the real estate development arm of the billionaire Latsis family, is behind the two largest shopping malls in Greece as well as office and residential complexes.
Ms Christopher, the daughter of a miner who trained at the London Academy of Music and Dramatic Art (Lamda), married Burton when she was 19 having met him on the set of her first and only film, The Last Days of Dolwyn, in 1948.