I got the new air compressor up and running. and the engine is a runner!
It was a little stiff to start of with, it would move on anything under 3bar but now it happily ticks over on 1-1.5bar.
The flywheel has a bit of wobble, but I think that is due to the crankshaft not being totally straight. I'll make a new one later.
I'll keep running it in and give her a go on steam later.
Here are a couple of pictures and the video:

