Moli, the NATS ATCOs staff Aberporth Radar on behalf of Qinetiq, not the airfield. I think they're either seconded from or under administrative control of NATS Cardiff.
The airfield (West Wales Airport) employs its own FISOs and as far as I know, is not owned by Qinetiq, although both the radar unit and the airfield used to be 'RAEs' many years ago.