1st time for me commenting in this thread, but Gorgeous photo's Rue 👍, i would visit it more frequently but slow computer takes ages to load pics, will definitely check out your Flickr next time i'm on it though.
You're very lucky to live so close to Castle Combe (been there a couple of times), really love the MGB (i think, could be wrong) pic and the MK1 Escort pic... man i'd love to have them cars sitting on my drive.
also like the crazy red Mini and rare Zagato Alfa, as well as the Suby Brat and Montego (haven't seen one of those in years).
Some nice stuff from Combe there, difficult circuit to make looks particularly exciting due it's rather poor angles that the track offers to spectators. You definitely seem to have got the hang of panning, in particular the Golf Mk4(?) is a great pan.
Most the head-on's are pretty good too, although I'd try to make sure that if you've got a bit of wheel showing just take the shutter speed down a tad to show some movement in the alloys. Also, as a bit of criticism I'd maybe try to take some wider shots - they often help to place the car in the background a bit more and give an impression of location, speed and movement. This can be tied in with using a slower shutter speed too. Other than that...can't really fault them. Definitely nice and sharp.
Also top marks for staying out in the rain, I know it can seem a chore when the weather is miserable but you usually manage to get some decent shots with the various rooster tails.
I realise I'm probably repeating stuff you probably know, but I thought I'd share my opinion! Hopefully it's actually helpful...