Thanks for updating this.

If a road no longer has a number, it may be better to delete the ref=* tag, or change it to was:ref=* rather than using ref=Unclassified

If you've got access to GIS software, you might find that OS Open Roads is a useful resource for road names, numbers and official classifications
https://wiki.openstreetmap.org/wiki/Ordnance_Survey_OpenData#OS_Open_Roads