I did a formula experience a coupple of years ago at Mantorp Park, it was awsome. It was pricey eur1000 but I bought the ticket for half price. Vauxhall/Lotus variant of the formula ford with road tyres. Half day theory, half on track, 3 drivers/car so its not alot of laps (3*4fast laps I think). It was day one of a 2.5day rookie license school (the .5 day being a exam). Day 2 is only available in a radical for a heafty eur1500.
Instructors was very competent, one is race director in stcc, the other was a former works team rally driver.
I seriously consider it better value for money than to be nannied in a supercar. (unless you hit jackpot like Scrabby)