I think that is the whole point here - it costs a certain amount to provide a 24-Hr all weather SAR service, BHL know what that is and will have bid with a modest (or even zero) profit on top (I think they bid at a loss for UKSAR).
It is easy enough to undercut the competition if you are prepared to cut corners or don't accurately know what the costs of that service are.
So in going for the lowest bidder, the customer has ended up with a bag of crap instead of what they asked for. Surely CASA should pull the plug on this operation or the customer should sack HNZ.