Best place to get old films processed?

I've found a cache of old films, probably taken by my late wife. They are about 10 years old, I think. Can anyone suggest the best place to get them developed, since they may contain irrepalceable stuff. Obviously they are way beyond their sell by date, but they have been stored in a dry place in proper canisters. There are a dozen or more rolls of 35mm colour print film.

Just have them processed normally, at any high street lab, like SnappySnaps or Boots. Modern colour print and black and white films are very stable and do not deteriorate for many decades. Slide film though, is much more prone to colour shift and fogging, if left unprocessed for a long time.
I have developed exposed print film that was over 30 years old, without problems.

There are specialist labs that can process very old and delicate films, but in your case, I don't think you need it.
Have a couple done in Boots, and if all is well, do the rest.