As part of my writing activities, I came across Ian Soady; Ian was kind enough to provide an illustration, hitherto published in RealClassic Magazine, for the Bantam Restoration Guide. Here's his website - check out the Sunbeam restoration:
http://www.iansoady.org.uk/
Here's Ian on George Brough's SS100 at the National Motorcycle Museum's "Ride a Classic" day:
