Personally I think either option would be appropriate (especially as you point out above, there are plenty of examples of roads that are signed in brackets but in error, as they are the actual road). I just don't feel strongly enough about the existing layout versus the changed one to do it myself. So if you feel more strongly about it, I support you :-)

Not as a primary reference, but taking a look at [a well-known government-backed copyrighted mapping source] I see it is marked as the B95 from the A522 roundabout...