Who says you are a teacher?

It never ceases to amaze me that in this day and age of health and safety, political correctness etc. etc. that there is absolutely no check on instrumental/vocal teachers who teach at home - even those who teach in schools but are not employed by a music service - at school of course it comes down to the Head of Music to check the quality of teaching but how often does that happen?  There should be some professional body that peripatetic teachers need to belong to (obviously there are unions etc but who checks whether they are a member?). Don't you think that peris should have some kind of basic teacher training?  A while ago they were talking about CRB checks for people who give children a lift to school - what about peripatetics??  How do parents know the people they are leaving their children with are 1) Safe and 2) Can actually teach?  There are plenty of people out there who are probably excellent on their instruments, but that doesn't mean they can teach.  I'm sure there are also plenty of 'teachers' out there who aren't very good at either - there is nothing to say unless parents ask to see some kind of instrumental/vocal qualification.