Chiv would only refuel at Culdrose if their cab was already on a job and another long-ranger in the SW came up
...or they didn't have an aircraft, or there was only one job but it was beyond the range of a Mk 5.
I'm well aware that this doesn't happen often, but my original point stands that there seems little point moving the SAR unit 'inland' from Culdrose to Newquay. Or am I missing something?