St George 's School for Girls, Edinburgh, this year celebrating its centenary, is host to four contenders competing for the title Mastermind 1988 Sandy Macpherson (chartered surveyor) The life and works of Eric Linklater Edward Cadden (civil servant) British civil aircraft since 1919 Kenneth Gray (retired schoolmaster) Pianists and piano music 1800-1930 Bill Taggart (clothing manufacturer) The history of British canals 1759-1948