I am a member of MIAS (who on Earth decided to use that for its acronym!)
It covers all the risk assessments, heath and safety, liability and other things that stops you being prosecuted. It also teaches you the step-by-step teaching points of skills, which to you and me are fairly simple but to some may not be.
I wish I could give you more information, but I have never used my qualification.
I would give them a call and see what they provide. I am only a member as I did a training course a while back and it entitled me to become a member of... (wait for it)...MIAS.