Good luck to your son. Great to see a mk1 golf out there amongst all the French and XR2's, and great to see the camera on board on the website.
More people with a bit of spare cash should be doing this, rather than waisting thousands of pounds 'chaving' up Saxo's. They must be mindless! As you say, for spectators its as exciting championship to watch as any, although I haven't seen it this year. I normally get to Donington, Oulton Park, Silverstone and Rockingham (SCSA stockcars) through the year, so will look out for you at some of these tracks.
I have driven at Donny, Silverstone, Snetterton, and used to race around the short ovals, so my main support is for National Hot Rods, F1 Stock cars, Bangers, etc. but I'll keep my eye out in Motoring News for your son!