+1 for Jacks Instrument Services, Salford. Just picked up my Retrovibe bass and its exactly how i wanted it. Jack made a new bone nut, fret level and polish (inc sharp ends), full set up (inc electrics clean) and even knocked me up a new TRC from some scraps of scratchplate he had knockin round. Action is briliant, exactly as i wanted as he took time to ask about my playing style and recomended how he thinks it should be set up. Comes with a check-card tag which lists everything that has been done and includes a 2 month guarantee on work. If i want it tweaking within this time its free. Very knowledgeable and had a good chat about various basses n valve amps. Will be taking my pride n joy, my main bass Burns Bison for some new pots soon. That is as much as a recomendation as anyone can get, i wont let most people even TOUCH the bison!