Help Me To Fuel My Needs

Since my first race day at Shennington I have been looking at many different race circuits. I feel that I can truly say that my knowledge has dramatically increased! I was wondering if anyone knows any good race circuits around the Oxford/Aylesbury/Milton Keynes area ...

I am also looking into aquiring a kart of my own, do any of you know of any suggestions? I have been looking at a Comer Cadet but judging by their engine size of 75cc I do not think that a Comer Cadet would fuel my speedy needs. However I think the major jump up to a Rotax Mini with 160cc would be a very large jump and would result in many crashes and spins! Any advice would be greatly appreciated!