Field In Sight wrote
So if you can receive a RADAR Service from an APPROACH call sign, what's the point of having a RADAR call sign at all.
Personally, I think it was a way of "showing off" when the facility had radar installed, in much the same way as Heathrow has a DIRECTOR to show how big and importand it is
It is historical, the procedural controller used to be top dog and this is reflected in the Approach and Area control sections were it basically says that the radar controller can not do anything without the approval of the procedural controller.
I believe years ago the radar controller would only be used to solve conflictions that could not be done procedurally, hence two different frequencies. These days more often than not the procedural and radar controller are one in the same.