This fantastic bike has been restored by some very reputable people; Martin Arscott rebuilt the engine, Gearbox rebuilt by Nick Paynton, Girders by Ray Daniels, Magneto by Dave Lindsey, Speedometer by Speedograph Richfield. Wheels and hubs also rebuilt.
Tinware painted in good old cellulose.
Paperwork mentions a KTT cam and it is fast. 
Best available? Maybe.
Comes with a thick folder of service history back to 80s, old MOTs and tax disks, V5c and 1956 RF60 log book.