DG
None whatsoever, just personal experience of 18 years flying for HM, most of it SAR. I have no authorative documents or statistics and I am not entering a bun fight as I really don't care whether you fly 3.5hrs or 4.0hrs. The point I was making was in response to Crab who immediately jumps in on anything to do with SAR and turns it into a p*ssing contest. I have flown SAR in both the military and civil sector and I can honestly say that the serviceability factor of the civil sector far outweighs the availability of HM's available hours for training. Unless the SK fleet has had a remarkable upturn in serviceability, I doubt much has changed.
I have never said that one side is better at the job than the other - I'll leave that to Crab as he has a monopoly on ill-informed bias.