Some, although not all, circuits run their own trackdays.
Those that have their 'in-house' days directly on their own websites are listed below, adding to your choice. As to whether you book with any of the track day companies listed or directly may come down to who offers your choice of day at your sort of price. If you have been to a particular circuit or have a favourite circuit, send us a concise review of it and we will post the best ones up here with my own comments and observations.
MotorSportVision run Brands Hatch, Oulton Park, Snetterton, Cadwell Park and the multi-layout Bedford Aerodrome, so this one website offers you access to five different circuits worth of choice!
Castle Combe - One of the best circuits in the country in my opinion. It has fast and slow, technical and tight and then open, and it is a real driver's circuit without doubt. You don't need power but you do need stopping and handling. Turn up at Combe with your biggest set and it will reward your bravery - just never sit in the passenger seat with someone else and look at the run-off as you approach Tower!
Croft - Another of my favourite venues simply because wet or dry it is a great place to challenge yourself. The big run down to Tower is mighty and especially if you get Clervaux and Hawthorn right, the Jim Clark Esses and Barcroft will test your resolve if you have a decent amount of horsepower and the Complex will tax your front tyres and your car control. Fantastic!
Donington Park - Donington is about to be changed forever, but before it does go and savour the heady mix of that big flat-out back straight, the rush of the Craner Curves, the complexity of getting Redgate right and the sheer variation in gradient. For better understanding of Donington try to get to your track day the evening before and go and walk the circuit - it will surprise you, even if you have been there before.
Knockhill - My local circuit and where you can find me instructing. A short track with much gradient and a technical aspect that even challenges racers. Several blind corners add to the mix and all of a sudden you have a recipe for one of the best days out whether you are front, rear or four-wheel driven.
Llandow - This looks like it would be a straightforward circuit, doesn't it? Think again. Relatively short, relatively narrow and with more than one corner that is technically tricky, what looks the outline of a loaf of bread turns out to be way more challenging and way more fun, especially if you have a lot of power.
There are formal track day events run at the Nürburgring, but this page of the official website offers the schedule for the Touristenfahrten (Tourist Drives), when you are literally able to turn up in whatever road legal car you own, pay some Euros and drive the Nürburgring in all its green and twisty glory!