"waiting time"

As we walk in NHS hospital for an emergency, average time for waiting to see doctor is 3 hours. But I think doctors are misusing this time. As I walk-in to city hospital Birmingham at 4 am, there were only two patient who were waiting to see doctor. they have been dealt with in one hour. I thought I will be calling my name soon. So I waited patiently for another couple of hours. And finally after doing nothing for two hours they call my name. My question to NHS is, Do they have any kind of mystery patient, who audit these doctor's work.