Not been to Keevil yet but done a few days at Hullavington.
If you're going with Motorsport events its a very good well run day with plenty of track time.
I'll possibly be booking another day towards the end of this month / early next month, depends on the MOT and what date the wife can get off.
The days are very relaxed, very safety orientated, and very addictive. If its your first time then I suggest you book a 20 minute lesson which will cost you £20 but well worth the cost. You can book and pay for this on the day.
Hullavington has 2 straights where you can get up to about 100mph, 2 or 3 tight second gear corners, and the rest is third and 4th gear driving and cornering. (Obviously faster if you have something better than a Golf).
Make sure you have plenty of brake pad material left, recently changed brake fluid, and give the car a good inspection for leaks and loose items. Make sure your fluids are all topped up and go and have some fun. There is no pressure (only by yourself) to go faster than you or the car can handle, and all overtaking is by consent and fully explained beforehand, so you should never feel pressured or fell like you are holding anyone up.
Cheers
Paul