In 1964 the family moved to a farm near Newport, Pembrokeshire. The 1970s saw Seymour's publication rate reach its peak. In 1973 John and Sally wrote "Self-Sufficiency" and in 1976 "The Complete Book of Self-Sufficiency" was published. Appearing shortly after the publication of E.F. Schumacher's "" (1973) and "The Good Life's" first showing on British television (1975), the sales of the book exceeded all expectations. It was also set to establish the reputation of two young publishers, Christopher Dorling and Peter Kindersley who had commissioned and edited the work. In addition to self-sufficiency he wrote four guide books in the "Companion Guide" series.