It's alive - nearly.
I'm not able to put a variable AC voltage onto kit as I don't have the equipment but I am able to stand things on a still in the garden and hope for the best.
The plan paid off
It beeps for a second, the fan runs and the first time it made a raster on the screen but that says quite a lot.
The second time it's given me vertical bars in the raster which I think are showing me the character cell and that there is a RAM/char ROM issue.
Next time I'll check power supply rails and start cleaning pins and sockets.
I've put a UK plug on it