American-designed tractors such as Fordsons and John Deeres were among the first vehicles working British fields in the early 20th century but Harry Ferguson's innovation of a versatile three-point linkage system made the Ferguson TE20 a popular choice after the Second World War. This illustrated guide reviews the models built or used in Britain up to the present day, with brief company histories for over 30 famous marques from Allis-Chalmers to Zetor.