My friend Mogg Hercules, who has died aged 80, set up and ran a remarkable school in Clerkenwell, central London. Its motto is: “Value your own worth and understand the differences in others.” Born Maureen Atkin in Worksop, Nottinghamshire, she was the daughter of Charlie Atkin, a bricklayer, and his wife, Connie (nee Smith), a machinist. The family moved to Melbourne, Australia, in 1949. Mogg, whose name came from her younger brother’s inability to say Maureen, won a scholarship to…