首席非官守議員
Pollock was appointed acting Attorney-General for three times in 1919, 1925 and 1928 respectively. In his capacity as acting Attorney-General, he sat in the two councils as "ex officio" member rather than unofficial member, and his unofficial seats in the Legislative Council was provisionally elected by his fellow Justices of Peace. In 1917, he succeeded Sir Boshan Wei Yuk as Senior Unofficial Member of the Legislative Council; later in 1926, he also became Senior Unofficial Member of the Executive Council after the death Sir Paul Chater, and therefore became the Senior Member of both two councils. Nevertheless, on 16 September 1928, Pollock had an accidental fall in his home at No. 367, the Peak. He broke his thigh heavily and could not assume his duties in the councils. As a result, another member of the Legislative and the Executive Council, Sir Shouson Chow, temporarily replaced him as Senior Member during his incapacity. Pollock recovered from the fall in December and reassumed his duties again.