@NQWhy
I assume your talking about a procedural service and if so that's already been mentioned above.
Procedural services haven't been used/taught within NATS for years. You have to talk to controllers who are just about to retire who then only just remember them. They also tell me that there was a dedicated met officer based there doing the observations. So it might be legal but in reality it hasn't been used for donkeys, probably because of the development of radar and increasing traffic levels. So at my unit (and probably all other NATS units) it is not approved/legal. If the radar was to fail, movements stop.
Years ago at units where they used to do procedural services who got radars installed, I can imagine that most if not all controllers were more than happy to forget about procedural services and have another ATCO providing a dedicated radar service.