Jenner was also a key contributor to T. F. Dale's book Polo Past and Present.
He also won the Ranelagh Public Schools cup in 1901 with the Old Marlburians[3] and the Roehampton Trophy in 1903, 1907, 1908, 1909 and 1910.
After retiring from the army on 4 May 1904, Jenner became the polo manager at the Ranelagh Club.
In 1912 Jenner's handicap was raised to 8 goals, making him one of England's top players at the time.
[4] He also won the Army fencing championship at the Royal Military Tournament in 1895.