Booking for Croft this year but have NEVER driven on a track!

Has anyone been on one of them days, where you jump in with an instructor, and they show you all about racing lines etc...

If so who did you do it with and where? Did you use your own car or one they supplied..

Want to go on one before the day! Any recommendations? I'd pref want to do it at either croft or oulton park as there closest to me!

Thanks!