One of the justifications often quoted for keeping a military SAR force is CSAR; but since the Falklands the MoD has not, as far as I can recall, detached any SAR assets with forces going to operational theatres... any SAR requirement has been met by assets on scene (or assumed that we could call upon the assistance of Unckie Sam to help us out)
I feel CSAR is destined to become a secondary role for SH, whilst the UK shores are protected by the Coastguard... or maybe RNLI helicopters, now there's a thought?