Classic Lightweights UK
Classic Components 

Leone large-flange Q R hubs

Peter Underwood 

Holdsworth introduced the Italian Leone hub to his catalogue, Aids to Happy Cycling, in 1955, they were listed for two more years without illustration or much detail. They were dropped in the 1958 catalogue.  It is a very rare hub and I only know of one (Scarlet) in existence.

Leone hubs