In 1965, Farrell moved to London to form a partnership with Sir Nicholas Grimshaw. In 1980 he founded his own company, Terry Farrell & Partners. In addition, Farrell lectures at a number of different universities including Cambridge University, the University of London, the University of Pennsylvania, and the University of Sheffield. In the early part of his career, Farrell gave emphasis to housing projects. Later, after the break with Grimshaw, he became the UK's principal postmodernist and was best known for the TV-am headquarters in Camden Lock and the redevelopment of Comyn Ching Triangle in London's Covent Garden. In the 80s and 90s his projects included Charing Cross Station, the MI6 headquarters building, The Deep Aquarium in Hull and The International Centre for Life in Newcastle. More recent work includes the new headquarters for the Home Office, the conversion of the Grade 1 listed Royal Institution of Great Britain and the Great North Museum in Newcastle. He has been responsible for regeneration projects in the UK including Newcastle Quayside, Brindleyplace in Birmingham, Edinburgh Exchange District, Greenwich Peninsula and Paddington Basin. He has also designed his own buildings within these projects, including the Edinburgh International Conference Centre and The Point in Paddington Basin. In May 2010 he was appointed to regenerate the 72-acre (29 ha) area around Earls Court exhibition centre. In 2012 his practice was appointed as masterplanners for Wood Wharf – the next phase of Canary Wharf's development. In East Asia, projects include Incheon International Airport in Seoul and Beijing South Railway Station – the largest in Asia. When completed in December 2010 Guangzhou South Railway Station was for a time the largest railway station in the world. Since setting up his practice in Hong Kong in 1990 he has designed the Peak Tower, Kowloon Station development and the British Consulate-General, Hong Kong. His KK100 tower in Shenzhen is the tallest building ever by a British architect. Farrell is on the Design Advisory Committee of the Mayor of London. In 2008 he was appointed Design and Planning Leader for the Thames Gateway – Europe's largest regeneration project. Farrell named CBE in 1996 and made a Knight Bachelor in 2001.