I'm on one in July, though it's free for me, as I won it in a competition at Sturgess in Leicester. Really looking forward to it. Chatting the guys who went last year said it was a great day.
The 'Racing Heart' Track days are great fun. They used to be foc, but if you haven't done one before £200, while not that cheap, is a great half day driving the Jaguar range of cars (mainly 'R & 'S models.) Well organised, good f&b.