Shabba,
I've been on two wet grip handling days at Rockingham Raceway, one with the Alpina Register and one with Scoobynet.
They were both SUPERB days and I learned a hell of a lot on how my Impreza handled, coming away from the second course able to hold huuuge sideways slides and also having learned a great deal on wet weather handling in a safe environment. The trainers were also superb.
I would suggest we got a trip sorted on this forum, but we struggled to get the figures on Scoobynet, having to draft in some Pistonhead guys too to get the numbers. It worked out at £125 for half a day if I recall correctly and if the facility was nearer to me, I'd be there everyday and broke...lol!!
I'll try find some pics and videos for you...