Pasptoo,
I think you will find that the SAR-H bidders would prefer to recruit from the current UK mil SAR personnel be they RN or RAF to make up the numbers. Its a simple case of being cheaper and lower risk and that they are all in current flying practice across the full range of SAR skills, particularly NVG. Cheaper because they will just be converting to a newer type and lower risk because they have already been filtered by a very rigorous training system.
Civilian UK SAR contractors have not recruited from abroad in the past and I can't see them doing it for SAR-H unless they absolutely have to.
CD