I have seen on some ski sites that there is some type of qualification for towing water ski dudes with a powerboat. Anyone know if it's a "proper" qualification or is it some local test ?
It is a real qualification. It is a british waterski federation ( or club) qualification. SBDA I think it is.
Here you are, try this:- http://www.britishwaterski.org.uk/UK....aspx?tabid=53
Here you will find about the courses and also find a local centre to you.