Thanks guys for the speedy quality responses. Never look a gifthorse and all that, but I get the impression that a 'free' set of wheels to help a neighbour clear out his shed could be leading me into handling & scrubbing issues, or worse. That's if I could find the right adaptors to get them onto the Vitesse in the first place - and adaptors don't look cheap. I certainly wouldn't do anything with the wheels before I'd shown them to a tyre fitter or wheel refurbisher.
Thanks again.