Terry Farrell, who has died aged 87, was arguably the most influential and prolific of the architects associated with the British postmodern movement. At the start of his private practice in 1965 he worked in partnership with Nicholas Grimshaw, and a few years later he seemed destined to join Richard Rogers and Norman Foster as a “high-tech” pioneer, the first movement in British architecture to achieve worldwide recognition since the arts and crafts designers of the late 19th century. A residential tower in St John’s Wood of 1970, streamlined and…