Good evening,Jonathan,and thanks for trying to help. I've just found my 2014 Machine Register,and I found what you mention.Sadly,I own frame no.T35/S/2027,but not engine no.2131.I'll be in touch with Len Boydell,even if it's 50 years too late! Tomorrow,I'll trawl through the rest of the Mk.section,as I only examined the Mk1 part so far.Of course,there's a good chance it's outside the Club by now.Thanks again,all the best,Ken.