Average track day costs £200. Add at least £100 for fuel on track, £50 fuel for the round trip. Take into account tyre degredation costs and pad wear. Add some instruction. Some money for food.....
Not much change from £350 for a day in a Mini on track. In fact your probably looking at over £400 at a decent curcuit... I've done 15 or so track days, thats what it costs....
And I NEVER bothered with the extra cost of insurance for the day either.....
Motorsport is dangerous. To you health and wealth......
Bike days are much cheaper obviously...