I didn't want to leave this thread hanging so,
I contacted three different spindle repair companies (by the contact forms on their websites, maybe not the best way) including the official Kavo/Sycotec UK repair agents and only one company replied saying their spindle repair tech would get in touch within a few days, and since then, nothing from any of them, zilch.

If I didn't have a spare machine available I would be tearing my hair out by now.