Just a thought, but isn't the 135 and 902 are already being used worldwide for winching. I appreciate that they will not be capable of operating in a safe single engine flight configuration whilst winching but then again can you name one that is (Operationally and not in training). From what i've seen of air ambulances they are the latest generation of safe helicopters that are totally underutilized in their capability and could quite easily be a useful asset to the emergency services by being winch equipped and at the same time aiding the already overstretched UK SAR force over land.