kharmael
That is not quite how I think it works, unless things are different in the RAF.
Amber and white ratings do not require you to fly to the same limits as green during IRT, and the RN certainly still has Master Green, and yes you can have a restricted green. The ratings have nothing to do with what stage of training you are at. If a 5000hr Seaking pilot goes lynx, he will get a white (probably flown to green limits) until he has the hours on type. Students can get a white rating on training aircraft.