I dont want to put a dampner on any of your Kart-Start experiences, but..........
.......Please..AVOID KART-START LIKE THE PLAGUE.
I used to work for them. The karts are really not the best, and the staff that they employ are invariably not karting enthuisiasts but local neds hell-bent on taking all of the fun out of the experience. They dont know the rules, they dont want to know the rules. They see their moment of power and stamp on anybody deemed to be getting anything like rowdy. A £30.00 karting experience can become VERY expensive per metre travlled if you are hauled off after the 1st or 2nd lap. And Ive seen it happen time and time again. Its not only me who thinks it, as when the Oil companies around here are organising corporate days out now, they would rather travel all the way to knockhill to use their out door track, and where racing has not been lost in the bid to take money off of the client for an ultimately tame and boring driving experience.
SORRY.......just my 2c worth, but I think its valid. There is a track, out to the west of Glasgow, which is very good. I forget its name, but its a fair size, and the karts are quick. There is a long curved straight allowing a good 6-7 seconds of foot to the floor stuff. The track at Knockhill is wicked (especially in the wet - ive got the trophies to prove it) :)
Ill be up for some karting fun, dpending apon where and when it is. All i ask is that you cross off Kart-Start Kirkcaldy and Dyce from your list, as its really not worth the money, when there are SO MANY better venues out there.