Excellent summary there Chas
I would like to also add a mention of the alternatives to the Uno Turbo - other FIATs to consider: the Tipo Sedicivalvole, the Punto GT. As the price of a good Uno Turbo goes up, and as most Uno Turbos become more rusty, it may be worth evaluating those two alternatives; more modern, the use of galvanised steel, possibly more practical as everyday cars, something more likely to be in the condition of "getting in and turning the key".
Many Uno Turbos are probably nearing the point of needing a total restoration, a complete strip of the bodyshell to allow proper de-rusting and repainting. Is this within your plan as a buyer?
Unos are renowned for electrical faults, yet mine has been very reliable - probably because it is kept in a garage and used rarely, usually thrashed mercilessly at track events.
I came to the conclusion recently that the Uno Turbo makes a natural racecar. FIAT has made many performance improvements for you - all you have to do is remove most of the flimsy interior, and it's ready.
The Mk2 has more suitable trim for daily use, but is still missing the modern-car features such as airbags, air conditioning, traction-control. I suspect for the same money as a good Mk2 Uno Turbo, you could probably buy all manner of newer cars for daily use.
Other than that, I don't have much to add
-Alex