Realised that, as per the link above, a small portion of the road coming off Whiteladies Road had already been marked as one-way. Have reverted my edit for the rest of it: sorry about that, and thanks for spotting.

It's definitely no entry to cars from Whiteladies Road (though bikes can enter) now - walked by it as I logged. I didn't actually spot any one-way signs, so suspect on reflection it is still technically a two-way street. Any advice on how to best record (some debate at https://help.openstreetmap.org/questions/6071/no-entry-sign-at-end-of-two-way-street-how-to-tag)?