Thanks, Darren. I'd no idea such stuff was available. As well as restorations, I can see uses for it labelling knobs and switches. I wonder if, with experiment on sizing the image, it might even be possible to make a graduated dial by wrapping a decal round it - the numbers would look better than I can do with a punch. It would probably need a few coats of protective varnish.
One slight problem is that I only have a monochrome laser printer, and I don't know if toner would take on the decal paper, or if the paper would withstand the printer's heater.
Andy