WC
It's a UK thing where we have more than just your basic ICAO Radar Control Service (RCS) and Flight Info & Alerting Service.
Outside controlled airspace (Classes A to E) UK also adds Radar Advisory Service (RAS) where IFR a/c get a service not unlike RCS but not everyone participates and therefore separation is not guaranteed; and also Radar Info Service (RIS) where no separation is provided at all and radar derived traffic info and flight info is passed if controller workload permits.
If you want more info look at Manual of Air Traffic Services online at
http://www.caa.co.uk/publications/pu...ils.asp?id=222