By the sounds of things, if both the Approach and Director do the same job then.....
In busy traffic Approach is a radar service handling all IFR transits and VFR flights in the vicinty of the Aerodrome and Director is sequencing all IFR inbounds for the ILS
In light traffic both services are combined onto the one frequency which will be Approach.
If you don't recieve radar vectors when talking to Approach and you self position to establish on the ILS etc, then it is indeed a procedural service and may be because the radar is switched off and/or the service you are receiving is combined with with the Tower control position due to staffing.
This is because you can control in tower and provide a procedural service at the same time...
BUT
...You are not legally allowed to provide a radar service while working in the tower position
(However you may be identified (sqawk ident) so that you can be monitored on an ATM in the tower, as long as a radar service is not provided and the pilot is informed).
As for lowly approach controllers, procedural approach is a black art and a forgotten skill in todays air traffic and is often harder to accomplish well than radar vectoring.
What happens when you turn off the radar?
PANICK!!!!!