i qualified aswell 'wessex raceway'
just read the tips thing, and can't do much better than echo all that advice.
By far the most important things in indoor and outdoor corporate karts are:
1. be jenson button smooth
2. get on the throttle as early as possible especially in the hairpins, as these thing have ridiculous small amount of power at low revs.
3. i find the best way to overtake in these things, i to do a switch back, stay outside turn-in late and get on the power several meters before the other guy/girl and just drive past on the straight.
hope to see you in a latter
EDIT: give me a link to your track
