OK - thanks!
I'll update my "check list" https://github.com/SomeoneElseOSM/database_qa_scripts/blob/main/osm_ldp3#L119 based on the current contents of the superroute https://www.openstreetmap.org/relation/1992599 .
I'm pretty sure that there is more work to do around Hull - https://www.openstreetmap.org/relation/2452530 is the new route of NCN1 (and is incomplete) and the bit that goes to Hull and back at https://www.openstreetmap.org/relation/15975674#map=12/53.7664/-0.4168 is incorrect, though those are part of other routes.  chillly, who is local to Hull and the author of https://www.openstreetmap.org/relation/2452530 , may be able to advise further.