In addition to aluminum, Clarke sculpts in oak, silver, and glass, and occasionally other metals. Many of his sculptures have a religious theme, and his pieces are on display in many cathedrals throughout England, including Southwell Minster and St. Edmundsbury Cathedral.
Clarke has exhibited in New York, Zurich, Venice, Tokyo, and throughout the United Kingdom. He has been awarded numerous private and public commissions, including works for Ely Cathedral and the Norwich Castle Museum. His sculptures can be found in many private collections in the United Kingdom, Europe, and the United States, as well as the Britten-Pears Foundation and the National Maritime Museum Cornwall in Falmouth, England.