I quoted from the site ( http://www.unlockruncorn.org/rlrs ), where at the end of that page it notes: "The old line of locks in Runcorn fell into disuse in the late 1930s, and they were closed under the Ship Canal Act of 1949 and filled in. The Ship Canal Act of 1966 allowed the closure and filling in of the newer line of locks. The gates from this flight of locks were removed and installed at Devizes on the Kennet & Avon Canal."
But now that I have read this again, the gates allegedly in Devises are from the new line of locks that have been built over, so they wouldn't fit the old flight.