We do a lot of jobs in South Wales and we have never been asked to take a casualty (no matter how minor) to Singleton, it is always Morriston.
The only reason for using the Singleton LS is if the weather is too bad to get to Morriston and even then they transfer them to Morriston by ambulance.
What is getting worse now is the ambulance control/NHS dictating to the crews where the casualty should be taken rather than leaving it to the clinician in charge of the casualty (who has the best idea of the injuries) and the crew (who have the weather and fuel issues to consider) to make the best solution.
Our job is to rescue people from hazardous situations and get them to primary care - not worry about bed spaces, A&E waiting times or govt targets.