A short while ago I have come across one post which I believe you can find interesting. Someone will take a steaming dump all over it, but it clarified some of my questions. 
<a href="http://radcliffe3h.primaryblogger.co.uk/2017/12/28/training-programme-penning-providers-have-mexican/" / rel="nofollow">http://radcliffe3h.primaryblogger.co.uk/2017/12/28/training-programme-penning-providers-have-mexican/</a>