Thanks for all the advice guys.
I'm not wanting to name and shame at all!
RE: Not noticing unitl fairly recently. What can I say - I didn't look closely at the fret board! I couldnt get rid of the buzz and I wondered if it was jsut a bad isntrument rather than being a problme with the frets (I can set up a guitar properly). But could not get rid of the buzz despite adjusting the aciton and truss rod. It is not my main bass and only gets played on occasion. I was putting another bass to get sorted few weeks ago, so I thought I'd drop this one in too.
Dood - bass was not bought from the original maker. I just thought it would be nice to get a re-fret and general sorting out (pots had gone etc) from the original makers. With a new one on order, I was planning to sell this one on - but I want it to be sorted for doing that. Its a classic bass, and hopefully when its sorted be around for a while.
I think I'll just, politely, send them an email explaining the situation.