Character Mr. Warren Wikipedia: Mr. Warren (link not verified) 1911 ◢ Appeared once in 'Canon'. Mar 1911:'The Adventure of the Red Circle' 1994 ▷ Played by James Taylor once on Radio in 'Merrison canon radio dramas'. 19 Jan 1994:'The Red Circle' 1994 ▷ Played by Kenneth Connor once on Television in '1984 Granada TV'. 28 Mar 1994:'The Red Circle'