Following pics posted on FB by Paul Denham. Some suggestion is that it was a Silverstone long range tank. Maker is Duguid Brothers of Stoke Newington. From this MCN report it would appear that Duguid Bros were famed for building Tritons, and making motorcycle fairings back in the seventies. https://www.motorcyclenews.com/news/...cles-are-back/ The premises are now home to Bolt Motorcycles.