Thanks for listening and the kind words everyone!
You make him very proud! 
I’m proud as well, it’s great to see how much he enjoys playing the guitar. 
BTW, Ian, I’m not his teacher, although we play together regularly.
He’s got a proper teacher, a guitarist with whom I played in a band for a few years.
His name is Jeff Zwart, one of the founders of http://www.famousguitarintro.com.
This is him: jeff zwart - YouTube
Cheers,
Wim