So, I collected the enlarger and set it up.
It needed to be completely rewired as the electric cable was in a bad state and the original owner had wired on a switch in true 'death-trap' fashion. Luckily, it was an easy job just completely replacing all the wiring with modern heat-resistant flex.
I've not had a chance to print anything with it yet but first impressions are: the Wray Supar 4.5 lens on it will just about cover 35mm through to 6x9 -- I can get the frame to fill an 8 x 10 sheet from 35mm film if I push the head all the way to the top of the column and 6x6 and 6x9 are easy. The lens seems in clean enough condition, however, it seems to have a 32mm or 32.5mm thread on it so if I wanted to replace it with a newer 39mm thread lens I'd need to make a new lens board.
I'll try a few prints with the lens and see what I can get. I suspect that things are not in perfect alignment, so we'll see.
Both condensers are present and there are holders for 35mm, 6x6 and 6x9.
Thanks for the advice re: aligning the bulb, etc.