I think I recall there being one at the junction but was distracted by driving and an incident with an old lady and postman at the time arguing.

Yes, agreed - actioned in changeset/36206221.

Yes, an automated edit, but I was the user that set 99.5% of those tags originally. I left the source:ref tag as is, since the refs are unchanged. I messaged you about the U-refs, allowed a week for response, then matched them to the rest. It does state in the wiki that non-signed refs shouldn't use the ref key.

Conversely it also leads to the Centrum building. I think it best to only have officially signed names for foot paths, such as those in Bowthorpe, e.g. "Red Ant Way".

Does this path really stop short of connecting to the footway north of it? Is its name really "Walk to Genome Centre" or is that just a direction sign?

It would also be great if the local cycle network with HTML colour tag could be rendered in the Cycle Map render :)

They are more of a name than ref, agreed. I changed it since routing agents (e.g. OsmAnd) were saying "turn right on to Orange", which made no sense when spoken. The colours are already stored against the route relations. I shall probably remove the ref altogether and put the pedalway names into the name tag, the existing origin/destination into a note tag.

I suspect that was an editing mistake, since it is Royal Terrace from Royal Parade North to the top, with addressing suggesting that to the right of that it is Royal Plain.