Hullo! 

Thanks for your note. The map is edited entirely by volunteers, so it's a question of time before notes get dealt with. (If they're vague, or questionable or don't fit editing policies, they may never get dealt with; not the case here.)

Unfortunately we can't take data from the CCC adopted highways map, as it's compiled using Ordnance Survey data, and Ordnance Survey like their monopoly.

But for an edit of this size and (lack of) controversy, imo no verification is needed, so I will re-tag the way according to the details you've given.

It will take a while for independent data "consumers", such as routing software, to update their copy of the data. Some routers might only update, say, once a year.

But the change will be made, and will eventually propagate.

Best wishes.

PS, as you have an OpenStreetMap account, you could make such edits yourself. If accessing the map from openstreetmap.org, find the "Edit" button top left.