‘Veteran BBC news reporter and world affairs editor John Simpson always thought his great grandfather was Samuel F. Cody, famous for being the first person to fly in Britain and a Wild West entertainer.’ Alas, tonight’s episode of Who Do You Think You Are? is the last programme in the current series – so we’re looking forward to savouring this final show. In tonight’s programme, John Simpson will be exploring the story of how his great grandmother  left her husband …