(20 Jan 2022, 7:59 pm)Jimmi wrote Was operated by Classic Buses prior to that going off a quick Flickr search.
763 is a more recent introduction.
There's also the commercial service 765 between Crook and Consett at the start and end of the day (M-F)
Interestingly, just noticed on VOSA today the 765 has been registered from 20th January and according to that it is actually supported by subsidy.