I've raced there a few times with the guys from work. Great track but very rough as you go under the bridge you will ache in the morning, but hug it tight to the left and keep it flat out.
I always get black flagged, I tend to go for gaps which seem to close when I get to them...
The Karts are good, though they change them quite regularly and you need to learn how to drive them every time you go. The Track should have warmed up reasonably well by 7.00PM, the last time we went we were first on one cold saturday and it was like a skating ring with cold Tyres and Tarmac.
Have fun.. don't crash....................... much!