I am writing as the lead of the OptimoRoute organised editing activity (https://wiki.openstreetmap.org/wiki/Organised_Editing/Activities/OptimoRoute) for anyone following this changeset.

@rskedgell The sign is visible in recent Mapillary street level imagery, for example: https://www.mapillary.com/app/?lat=51.8905273&lng=0.8320383&z=19.9&pKey=2141368906240557&focus=photo

It is possible the sign is temporary. If you have a link to more recent imagery showing a different situation, please share it and we will review and adjust the tagging. Thank you.