Having done a long-range job off the coast of Ireland, we were only able to talk to Valencia using HF (250nm out) so I can't see why it wouldn't be a requirement for Irish SAR as well. Once the Irish get their S92s established and the Sea King retires, there should be no need for UK SAR assets to fly to the W coast of Ireland and then out to sea since the native assets will have the same range and capability.