But because we have a dedicated Distress & Diversion (D&D) service, based at West Drayton and staffed by military controllers using receiving equipment located around the country, then maybe it doesn't matter that commercial airliners in UK airspace don't listen in to the guard frequency as much as elsewhere. Maybe it is more important that this happens in remote locations (e.g. Australia, mid-Atlantic) and regions without a dedicated D&D service...