Hello Everyone, I also have a David Jones of Chester Boat called Rosie No 2, we do have a plaque to prove it. Apparently built in 1978 but with a mid engine 1976 Lister ST2 Engine and made with imperial plate steel on the hull. In the case of my boat, we believe it had undergone a major lifestyle change ( in 1976-1978) from a late working tug boat (1940-1950's) to a live-aboard/holiday boat. We believe she was either built as a pair or was called Rosie re-worked with the new steel front cabin. To find any of this documentation I believe I have to go to Manchester to the physical archives or to the Chester. Originally 40ft but was extended by 7ft in the 1990's by Welton Marina. Hope that information is interesting and helpful. Happy to send pictures if that helps people.