4. Sir Ian Wood and family – £1.819 Billion
Sir Ian Clark Wood, KT, GBE (born 21 July 1942) is a Scottish businessman and philanthropist. He is best known for his work in the North Sea oil industry with Wood Group, which he was largely responsible for transforming from a company of modest size, serving a primarily local market,
to a large corporation with operations in over 50 countries. He served as Wood Group’s chief executive from 1967 to 2006, and as chairman until 2012. His networth increased by £119 Million.