Distributor RS components has a calibration service for all sorts of test equipment.
I just received a quote of 220 euro VAT included for an accredited calibration for a 34401A multimeter, which includes full instrument adjustment in case something is out of spec.
The quote is about the same as some local labs asked me, but it includes the free adjustment which is a very big deal.
Do you have any experience with their calibration service? If so, what did you have calibrated and how the certificates look like?
Edit: they also offer non accredited calibration certificate, in this case the quote is 190 euro VAT included