The CG assets were (for about the last 10 years) supposed to be tasked through the ARCCK but could self task within 30 nm of their CG MRCC and then advise the ARCCK.
Correct, but this is no longer the case. This stopped from a about the time that Bristows took over the S92's at Sumburgh and Stornoway.
They will only accept a tasking from ARCC. The scramble lines that the CG used to use stopped and was taken over by the ARCC.