Barnaby,
I know what ATSOCAS stands for. But referring to my original scenario. If an airways sector suffers radar failure they cannot continue to provide radar control. Separation must be provided procedurally. So logically that sector must be providing a procedural service, albeit inside CAS. If 'Procedural Service' as a title has been hijacked by ATSOCAS, what should we call the non-radar service provided inside CAS when radar fails?