Since I'm still waiting for a computer to finish updating, I'll add some more.

The machine didn't appear to be in the best of condition, however on close inspection all the slides are in excellent condition, they just needed a bit clean. The spindle on the other hand didn't feel so good. Removing the spindle motor didn't improve the feel, so after removing a bit more, the problem became obvious-

The machine had got wet at some point, as there was rust around the spindle from where water had been sitting, so a couple new bearings, some grease, and the spindle is as good as new.
I still need to decide on the final preload of the bearings, as even the Denford guys say they were just done by feel in the factory.

The other issue, in true education system style, the mill had been used to machine wood. My lathe was the exact same, with dust everywhere, and a nightmare to clean.