Bluenose 50-
From the (good old?) days of the S61:
http://www.mcga.gov.uk/c4mca/uksar.pdf
Under an agreement between the MCA and the MoD, tasking of these assets is normally undertaken through ARCC, RAF Kinloss. Exceptionally, when helicopter assistance is necessary for immediate lifesaving, the MCA can task the helicopters direct and then notify the ARCC as soon as possible afterwards.
Kinloss cannot speak direct to the S92 on HF anymore, as the S92 disnae have one, now they rely on a satphone when out of VHF range.
edit- or top cover from a Nimrod! (RAF!)