The majority of high street labs are now digital. Perhaps you could post a
link to an image of your problem.

--
Dooey.

Was it an Agfa d-Lab.2 or an older (optical) Agfa MSC lab?

The Zeta printer in the d-Lab.2 can print from both TIFF and JPEG.
The high-res scans that I get from d-Lab.2 are relatively high-Q JPEG,
so I doubt you would be able to see JPEG artifacting in 4x6 prints.
Although it's possible the lab operator can turn down Q-level.

Absolutely!

Kodak offers this service in the US, under their trade name "Perfect Touch."
You can get the details at their web site.

The film is processed, then scanned, and then various digital corrections
are applied.  The image files are then printed pixel-by-pixel onto silver
halide paper, that is processed in chemicals, just as a regular photo print.

This process is good for amateur prints that might need some tweaking to
brighten shadowy areas, etc.  And, since the print is not made by projecting
an image onto the paper by an enlarging lens, the various types of
distortion that would ordinarily be introduced by a cheap enlarging lens
are, at least in theory, not present.

It makes little sense to use fine lenses and then have your film processed
by a lab that uses enlarging lenses that are not up to the optical quality
of your own lenses.  The mail-order lab that I often use, www.dalelabs.com,
uses Nikkor enlarger lenses that cost $10,000.00 each.