Yip been before -
Video here:
http://vimeo.com/2151357
Great circuit IMHO, good for drifting and fun stuff - also one of the fastest corners in GB outside Silverstone I believe.
The last few hundred yards into the paddock is also not tarmaced, so watch out for the tyres! Last thing you want to do is damage a cup on the crap surface
Fuel is a pain - it takes at least an hour round trip, possibly longer. Nearest 97+ is at Tesco in Holyhead. Take jerry cans if you can, otherwise plan to lose some of your time, especially if (like some circuit day organisers, not the one I was on thankfully) they only break for lunch for 1/2 hour.