Petrol - £100
Room - £60 (share the room with someone else and it's only £30 a head)
Food & Drink - £50 to £100 for the 2 days depending on how much you eat and drink!
Tour - £5.
It's not a cheap trip, however it is and awesome road trip with a load of other MINI's and great people. These are all rough costs, plus the petrol will be shared if you are taking someone with you..