 Edwardes was the eldest son of Captain William Edwardes, 3rd Baron Kensington, by his wife Laura Jane Ellison, daughter of Cuthbert Ellison, of Hebburn Hall, Hebburn, County Durham.Edwardes was elected to the House of Commons for Haverfordwest in 1868, a seat he held until 1885.In 1872 he succeeded his father as fourth Baron Kensington but as this was an Irish peerage it did not entitle him to a seat in the House of Lords and he was able to remain a member of the House of Commons.