Nigel, I have been looking for a good S/H Plus Six 18 inch alloy for a while, been a year now and nothing has shown up.. I thought the factory had both the 18 and 19" new in stock, but they are pricey..
Dave Plus Six "Squeak" Roadster departed. 1936 BSA Empire Star Q8. 1935 BSA W7-35. 1938 BSA M20