Richard's Bicycle Book, page 63. The book's drawing was taken from this photograph which appeared in Bike World magazine:
Compared to a Raleigh or Peugeot folder of the early 1970s, the Bickerton was a revolution in small folded size and light weight. As a bicycle, it was overly flexible, the ergonomics were odd and the handling was an acquired taste at best. Back in the day, modified for touring:
That's the pic/drawing! Well done sir!
Wow that's a big chainring on the tourer. Not unlike light touring on a Brompton with just a big front bag, multimode transport is easy. I can only picture touring on my Dahon Speed because at this point in modifications, it sacrifices little versus a 700c touring bike, in fact, the agility of the 20" wheels helps counteract the heavy steering of a fully-loaded tourer.