One of the giants of the British cycling industry, Claud Butler was no one man shop, but rather a large manufacturing business which turned out large numbers of frames.  They produced everything from track and racing frames as well as tandems in both lugged and fillet brazed varieties.  The Claud Butler name and trademarks were purchased by Holdsworth and frames carrying the Butler name were simply rebranded Holdsworth frames.  In the late 1980's a conglomerate which also owned Falcon purchased the naming rights for Holdsworth and Claud Butler and reintroduced the name.