Great video! Yes, the tail light out is just proof that it really IS an Uno and not some fibreglass shell on a dragster...
By pausing it near the start, you can see that these are Brazilian-built Unos with the extra strip under the headlights and the clamshell bonnet (looks like a Mk2 front, but is actually more like a Mk1) - this is for the Uno spotters only, of course... yes that's you, Chas
-Alex