There are so many options for historic motorsport in the UK these days that it is amazing, you folks are so lucky. I've been to the Silverstone Classic (nee Coys Festival) quite a few times and loved it. I understand from friends who have been recently that it is only getting better. The SeeRed meetings at Donington are also pretty good, although I've found in the past that Donington's marshals are a bit more 'jobsworth' in their approach to spectators creeping into the pit lane to get a good photo or two.* Pretty much every other circuit has something going on, although I hear on the grapevine that Brands and Oulton are the other two great club meetings. Of course, it goes almost without saying that the Goodwood Revival should be well up the list for anyone planning a trip to a historic meeting, although you'll not save much money over the cost of one day at the GP (gone are the days of 30 quid Revival tickets...). Anyways, I shall make do with the Historic GP folk showing up in Montreal next week, and possibly plan on getting up to Tremblant for the rather mediocre meeting that happens there every year, and I shall fume jealously for all you UK-based folk and your plethora of options!
*One year, rather cheekily, I decided in a quiet moment at Silverstone just to stroll across to the pit wall and see what I could see from there. Fortunately for me it was qualifying for the WSCC-class race. I didn't actually take any photos in the end, I just stood dumbstruck as Porsche 917s, Chevron B12s, Lola Mk3s of every hue, a Ferrari 512M and 312PB, and a McLaren M1A and M8A thundered past inches from my nose. After about 5 minutes a guy in official looking gear came over and told me that "You can't stand here son, sorry.." My heart sank. "Just shuffle a couple of metres down so I can hang this pit board out" he continued... sweet!