I went on the biker down course yesterday. For anyone who hasn't done any first aid lessons then I can see it being beneficial, but I was a little disappointed to be honest as it didn't cover the things I thought it would.
I was hoping we would learn about bike specific injuries and treatment, and discuss the do's and don'ts of helmet removal. Instead it just covered the basics such as a safe approach to the casualty, checking for a response, checking for breathing, getting help and putting casualty in recovery position. It didn't cover CPR but they did do it on request.
I do first aid each year at work to a higher level so if anything it was just a basic refresher, had I know this then I wouldn't have gone.