From BSBI Obituary:
He got his degree at University College, London, and then moved to Leicester to do a PhD on Carex section Acutae (now Phacocystis) under T.G. Tutin. This was interrupted by National Service, which he spent as a teacher in Kent, and then in 1958, instead of returning to Leicester, he got the job of Head of the Fern Section at the British Museum (Natural History), remaining there for the rest of his career, respected and liked by his staff for his sympathetic management. In 1990 the re-organisation at the Museum resulted in Clive becoming Head of Collections in the Botany Department until his retirement in 1992. He was the initiator and main organiser of the Museum’s Wildlife Garden in the grounds