But in the context of "what is the ultimate spec +8" asked in the trad forumi it's not a +8 is it

It's an Aero or perhaps more accurately what our German friends would describes as a Luxe. No doubt a desirable car in it's own right - Although for me the first of the Luxes that I could not see myself owning.

The Bill Fink +8+ is not a one-off BTW. I am not sure how many have been built but I believe it is in the upper teens.

I would agree you could argue whether the +8+ is a +8 (indeed a subject that makes the wires v alloys arguments consensual). But with a standard Morgan body, standard chassis, identical dimensions, same front suspension, same interior etc. It still gets my vote.