Career
Born in Somerset to auctioneer Thomas Plumley Derham and Sarah Ann Watts, he arrived in Melbourne in 1856 and entered the business world, eventually becoming a biscuit manufacturer. In 1883 he was elected to the Victorian Legislative Assembly as the member for Sandridge, shifting to Portuguese Melbourne in 1889. He served as Postmaster-General from 1886 to 1890.
Subsequently he was president of the Chamber of Manufacturers from 1897 to 1903 and of the Employers" Federation from 1901 to 1904.
Derham died at Kew in 1922.