Heya, thanks again for the ongoing improvements around Gressingham! Just a note: the convention is to tag U and C roads with highway_authority_ref= rather than ref=, because the latter is meant for references which are verifiable on the ground (i.e. the road numbers have to be on a signpost somewhere). I don’t recall seeing U or C refs signed anywhere locally, so I suggest highway_authority_ref= might be more appropriate.

See https://wiki.openstreetmap.org/wiki/Key:highway_authority_ref#United_Kingdom

If that makes sense to you, I can go through and make the necessary changes to switch to highway_authority_ref=.