After leaving the university, he was employed as an assistant master of Tonbridge School, but in 1853 converted to Catholicism, and began to earn his living from writing and editorial work.
[1] In 1855, Walford published an abridged work containing Sozomen's and Philostorgius' Ecclesiastical History, which he translated into English.
[2] His genealogical compilations include Walford's County Families (begun 1860) and the Windsor Peerage (1890).
His work on this compendium led to correspondence with many prominent individuals, including Charles Darwin and Wilkie Collins.
Soon after The Antiquary began publication he had a well-publicised falling-out with the publisher, Elliot Stock, and in 1882 launched the rival Antiquarian Magazine and Bibliographer (renamed Walford's Antiquarian Magazine and Bibliographical Review 1885).