Hi Ian and Europan,
I am also in Basel but dont have time on Saturdays, but PM me as I do have some time during the working day and work in town.
For 120 processing, I usually send back to the UK.
35mm prints and E6, Lörrach and Weil have a shop (Stober) which will handle these for you. CH has always been very expensive when I tried getting D&P done here.
As for studios - I am also looking and will let you know what I find.