Max Round-5 +5

John Lawrence Nettleship was a British schoolteacher who taught chemistry at Wyedean School, Gloucestershire. His pupils there included a famous author, whose mother worked for some time as an assistant in his department. The author began studying at the school in September 1976. Nettleship described himself in hindsight as "a short-tempered chemistry teacher". He has been claimed as a major inspiration for the character of ________ in author's books. Name the author and the character.