Thanks for the links there!
I also found this site:
http://www.arceurotrade.co.uk/
They have a lot of accessories for the Sieg C0 and C3, and also have some useful articles on replacing ball races with taper bearings too. I'm warming to these machines now as there is such a wealth of information out there regarding their use and aftersales spares and repairs too.
The prices of some of the accessory parts is amazing too - a quick change toolpost is a must have.
I'm still going through the initial tool buying stage at the moment, hopefully in the new year I'll be able to actually show some work in progress - rather than just post daft questions about machinery!