 Cook was also known for crafting the Japanese-style fans used by D'Oyly Carte and numerous amateur G&S societies for productions of "The Mikado" throughout the UK and abroad.After leaving D'Oyly Carte, Cook sang with "Gilbert and Sullivan for All" in his spare time.His wife joined the English National Opera chorus in 1984 and sang with that company for 13 years, into her 60s.