NorthSeaTiger to answer your questions:-
A. Ex Bristow guys already doing the job? Ex Jigsaw crews when they realise that there is a better deal on offer.
B. S61N, 332L2, 225, S92, EH101 your guess is as good as mine
CHC has loads of world wide experience in SAR the closest being the contract in Eire with S61s
332M