Jarvis set himself up at Warren House stable, Newmarket as a private trainer for A. E. Barton in 1914, but after two years the yard was closed because of the
First World War. After serving with the
Tank Corps Jarvis recommenced his training career in 1919 at Park Lodge, one of the oldest training stables in Newmarket. Jarvis won his first significant race in his second season when he trained Golden Orb to win the
Wokingham Stakes at
Royal Ascot, and confirmed his reputation by winning the
Ascot Gold Cup and
Eclipse Stakes with Golden Myth in 1922. Jarvis' success attracted the attention of
Lord Rosebery and his son
Lord Dalmeny who became the major patrons of the Park Lodge stable. At around the same time Jarvis employed Charlie Elliott as his stable jockey. Throughout his career, Jarvis was known for the amount of hard exercise to which he subjected his horses. His methods were considered rather old-fashioned, but often gave his charges a fitness advantage in the early part of the season. Another feature of his training programme was that he often sent a strong team to campaign in Scotland in autumn: he trained over 100 winners at
Ayr Racecourse, including three successive Ayr Gold Cups. third in the Derby. In 1938 Jarvis trained Blue Peter for Lord Dalmeny who had succeeded his father as Earl of Rosebery in 1929. The colt was beaten in both his races as a two-year-old, but he showed his best form in 1939, winning the 2000 Guineas and the Derby. He was denied the opportunity to win the
Triple Crown when the outbreak of
War forced the cancellation of the St Leger, but his earnings enabled Jarvis to win his first trainers' championship. Happy Laughter later went on to win the
Coronation Stakes and her earnings helped Jarvis win the trainers' title for a third time. In 1955 Jarvis threatened to retire after the
Jockey Club attempted to introduce new rules making trainers liable for any delays caused by adjustments to a horse's
girth strap before the start of a race. The rule was subsequently amended. In 1965 Jarvis, by now 77 years old, scaled down his training commitments by giving up his Palace House stable. A year later he had two of the leading contenders for the Epsom Derby in General Gordon and
Pretendre. General Gordon won the
Chester Vase but was fatally injured in training shortly afterwards while Pretendre was beaten a neck by
Charlottown at Epsom. Jarvis continued training until his death on 18 December 1968. At the time, Park Lodge stable housed a two-year-old filly named
Sleeping Partner who went on to win the following year's
Epsom Oaks, the only classic to have eluded Jarvis during his training career. ==Personal life and interests==