Sadly it is clear to me from what i've seen on the UKSAR2G tender it is all about reducing costs and not augmenting capabilities.
Only one aircraft / base for instance is not workable IMHO and these drones would be good to augment SAR in certain cases but not always because the problem with a search part (drone) and a rescue part (heli) is the time lost which we all know is a commodity we don't always have.
As always it looks realy good on a power point presentation especially what the cost factor is concerned .