Hmmm... I don't think there is a switch; the Tipo DGT has the switch, but the Uno Turbo display is clearly labelled 'km/h'. Good for us of course (in metric New Zealand), and actually over here it doesn't matter if your speedo is in miles per hour or kilometres per hour. It could probably be in metres per second, Mach number, percentage of chance to die in a crash, or light years per millenia... all the WOF inspection states is that the vehicle 'must have a working speedometer'.
If it's anything like the Tipo DGT unit (which it probably is), you'd find the Uno Turbo digital instrumentation to be an absolute pain in sunny conditions - because the segments are backlit and non-reflective, they are completely drowned out by low-angle sunlight. In fact, they've been mostly obliterated by the flash in that pic. I got a speeding ticket last year because of sunlight (in a Tipo), I was overtaking and honestly had no idea what speed I reached - apparently 115km/h, surprising when the car was running on three cylinders.
Update: just checked in my Mk1 Uno handbook - circular button in the lower-left corner is for resetting the trip meter. There is no mention made of changing the units (and if you could, you wouldn't be able to change the odometer or trip meter units anyway). You may find a setting somewhere in the circuitry, so it would still be worth a check if not too expensive.
-Alex
