Born in Oxford and entered the training ship Britannia
as a naval cadet in 1883; he first served in the Australia
during 1889 and 1890 and was promoted lieutenant in 1892; in 1896 he commanded the Hart
, an early destroyer, and was promoted commander in 1903, taking over several ships between 1904 and 1907; Tyrwhitt was promoted captain in 1908 and six years later became commodore, being then in charge of all destroyer flotillas in the fleet; he served throughout the First World War as commodore and, from 1918, rear-admiral of the Harwich force and engaged in the Heligoland bight and other smaller-scale actions; following the war, he was created a baronet and returned to sea as flag officer in command of the 3rd light cruiser squadron in the Mediterranean; Tyrwhitt was commander-in-chief, China station, from 1927 to 1929 and was promoted admiral; he became first and principal naval aide-de-camp to the king
in 1932 and during the Second World War, at the age of seventy, commanded the 3rd Kent battalion for a short time; he died at Sandhurst, Kent in 1951.