guidogad

I will try the Ozzie forum but still have hopes on British.
Having looked at a couple of leads that people provided, there is a certain style that can be seen at the early 70s, with wrap over seat stays, plain lugs and hardly any braze-ons. For instance the Holdsworth Professional, or the King of Mercia (with the plain lugs, see picture from the 1970 catalogue) can look very much like my bike. It's certainly not a Holdsworth (they all seemed to have a full sloping fork crown, riveted head badge, and a different serial number format). And it's probably not a Mercian either (one plus though is that the head badge is not riveted).