In 1930 Warriner went into colonial service with the Sudan Government. He returned to England in 1934 and went into business as an engineer. During World War II he was initially with the Indian Army but then served as a lieutenant colonel in the Royal Engineers in Greece and the Middle East. He was awarded the MBE in 1945. He was Deputy Lieutenant of Warwickshire and an alderman of Warwickshire County Council. In 1972, was chairman of the council.