I see people do that at the top of Foljambe Rd outside the old footy club all the time.
Up Foljambe is no right turn onto Saltergate, so go through the junction and then do a right. Done it myself. Nothing illegal. As long as you are aware and careful.
Also see people drive into town past Eyres and turn left up Cavendish St. Doesn't say no left turn.
Edit: Left turn, not right !