Wizurd, Santapod run DWYB (Drift what ya brung) days which cost £60 for the day. For this you get 3 or 4 play pens where you can practice drifting in a circle, figure of eights and then when your good enough you can twin with 3 others on the large kidney circuit. There should be no danger of anyone hitting you in the play pens as you drift by yourself.
http://www.dwyb.co.uk/index.html
or theres what the Barrel Sprint (Fueltopia) http://www.santapod.co.uk/calendar.php