Sarll returned to England soon after the signing of the Peace of Vereeniging on 31 May 1902. On leaving the army, he was gazetted as captain. From then on Sarll's temporary ranks included lieutenant, sub-lieutenant, trooper and provost marshal therefore also making him General Staff Officer. Sarll received two campaign medals awarded to participants in the war: the Queen's South Africa Medal, with clasps "Tugela Heights", "The Relief of Ladysmith" and "Cape Colony", and the King's South Africa Medal with the two clasps "South Africa, 1901" and "South Africa, 1902".