Hi Ian, it's a 1993 - but I don't think it is the clock, as I have a separate digital timer/speed meter and that is reading zero as well. Also the power steering feels weird.
I will get behind the clocks and see if I can find the mph converter. Looking at one on ebay it seems to be a little box with four wires - sensor in, 12v, 0V and output to speedo? At least then I can get someone to spin the speed sensor at the gearbox and see if I can read a voltage in and out of the converter.
If I can't find it I will take some pics of what is behind there
Rich