Last New Years Eve I worked with our local ambulance service as a volunteer crew. We work out of HQ and calls are either screened to us by an officer, or a fast response car with paramedic gets to the job and assesses it as suitable for a volunteer crew, then we get tasked to attend. Due to local restrictions we don't use blues and twos. In the five years I've been doing this only three people have noticed that we weren't paramedics.