Return to sender - see 3D's post for the reason they lost - I don't know the details but I think they assumed they would automatically get renewal because they had been the incumbents for so long and the detail of the CHC bid caught them on the hop.
I don't think Bristows will make the same mistake again and yes, if SAR H removes the miltary from SAR, then I probably would apply for a job with the contractors - they are going to have a to find a lot of SAR crews from somewhere and they might even consider letting me in (probably floor sweeping to start with)
When you say harmonisation you actually mean takeover because all attempts at real harmonisation have failed miserably - SAR is done 3 different ways by 3 different service providers with little in the way of commonality.