UK Civilian SAR has training limits not too dissimilar to the MOD, however since at present it is piggy backed onto the Companies Public Transport AOC, it is afforded CAA dispensations for training particular to the SAR environment. There are also company ops manual limits on training limits to provide a sensible, safety margin for the Crew and aircraft. These constraints don’t exclude the crews from achieving sound practise on a daily basis.
A civilianised UK SAR organisation would no doubt be set up without the limitation of the public transport AOC i.e it should have an AOC dedicated to SAR. As for actual SAR missions, at present there are not limits imposed by the CAA on what can be achieved or flown….just like the MOD crews. As long as a crew can justify what they have done to “save life” then you are quids in. The present UK MOD SAR crews aren’t going to double away aboard to do rescues in time of armed conflict…plenty of other great crews out there to do that….no magic involved. So the fact it will be in a civilian guise will not matter really.