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@Kernowdreamer
Looks like you have a bolt on front mech mount on your frame. is it tight in? Does it looks straight? I had exactly the same problem on a pre-owned carbon frame with Campag kit. Scratched my head for ages, changing the mech, altering the adjusters, height and angle etc etc. Turns out the front mech bracket had been wrenched and wasn't flush with the seat tube so the mech sat too far out and wouldn't clear the chain when on the smallest rear sprockets.