To answer a few queries:
The Black 5 wheels were castings only (loco. and tender) £195.89 delivered - see photos.
The Class 22 wheel set were supplied turned near scale for 1/32 (Scale 32) and are centre insulated for split axles mounted on said axles with pin £163.41 delivered - also see photos.
Both these were in his existing range. The Ivatt 4 wheels (loco. and tender) required a new 7mm master and were castings only £156.29 delivered. Finally, the WC/BB wheels (loco. and tender) I've just ordered to be made for 7mm are £194.40.
Not cheap but I think they are worth it when you have kits of the standard achieved by MOK and Finney7.
As Adrian mentions, he's still supplying the wheels but not offering turning any more, except for the Class 22 wheels it seems, which was convenient for me.
I intend to make the WC split-axle pick-up and so the wheels will be finished the same as the Class 22 wheels.
As Steph has said, there's some instructions and diagrams on Mark's website about how to turn his wheels. You need to make some aluminium discs to support them. I hope I'm not patronising anyone when I mention that you should practice on CI and not Steel, as it's quite a different material and also needs specific cutting tools (carbide tips). The profile tool should only be used for a fine finishing cut. I have the S7 Group tool for 7mm. Mark supplies a Scale 32 version which I also have and will use for my forthcoming garden venture.
Hope this helps.
Andrew