A friend of mine is an avid karter and a pretty good driver, if you want to race competively you need to pass a test and get a licence, theres a good range of classes to choose from, he's in the Rotax max class, a kart and all the gear would probably set you back about £3k, then you need all the usual maintenance gear and either a transit van or trailer.
I did think about joining him in it but just found it rather too expensive. Also you need to be fairly fit as its quite enduring racing with 20+ karts on a small track.
Thats quite a good price, track near me is around £120 for the hour, but if you've never done anything like it before a one hour race will be pretty gruelling, those pro karts are heavy going but still pretty fun, and fool proof.
Buckmore is a good track, I normally compete in the 3/6 hour endurance events held there in a team of 2/3. Have always finished in the top 6 out of a grid of 30+, so pretty happy with that considering the top few teams take it very seriously. Last time I raced was two weeks ago and still have a couple of bruises that the rib protected didnt completely avert, and the skin is only just starting to heal on the inside of my right thumb from a massive blister.
First and second chicanes are always the corners that catch new people out, brake progressively into the first, and then short and sharp into the second, you do not want to be braking while turning on either of them.
Went there a couple of years ago on a corporate day, did both Grand Prix (which I didn't do particularly well in, was still learning the track!) then a 25 minute "endurance" race, when I came 2nd - only a couple of seconds behind someone who had been an avid karter for years - not bad for my first ever karting visit