Major clients of the partnership included the Consumers' Association, the Post Office, British Telecom and London Transport, for whom they redesigned Edward Johnston's famous "Underground Sans" typeface, as New Johnston.
Banks was an influential designer, and his Telecom (T) identity, created for British Telecommunications when it was instituted in 1981, spawned many imitators.
Banks received a prestigious RSA/BBC Design Award in 1990, for the paper-saving redesign of the UK's Phonebook.
His approach is described by David Jury in the book About Face: "For Banks, it was important to respect the spirit of Johnston rather than adhere mechanically to the construction rules which would have made any further development of the design impossible."
Banks would later design a limited-edition book for the organisation as a tribute to Edward Johnston.