Twice Mayor of Camberwell. From the Wikipedia page [1] Sir William Lane-Mitchell (24 January 1861–1940) was a British Conservative Party politician. He was elected as the Member of Parliament (MP) for Streatham in 1918, and held the seat until his resignation in 1939 by becoming Steward of the Manor of Northstead. He was knighted in 1921. Some detail here [2].