Larry, The Sundial Register put out by the British Sundial Society lists 51 dials in Greater London (this is the 93/94 edition of their listing).
I believe it's available from Ann Somerville, Mendota, Middlewood Road, Higher Poynton, Cheshire SK12 1TX. Don't know the current price. Be sure to see St. Margaret's Church, Westminster; St Katherine Cree Church, St. Katherine's Dock near Tower Bridge, and the old observatory and Maritime Museum down in Greenwich (both of which have nice dials). Fred Sawyer
