I hear what ya saying Toonboy, and your concerns are legitimate, having done a load of track days in all sorts of cars, my answers would be ;
1) Very unlikely to roll at Bedford, the run off areas are massive. General rules on these sorts of days are no overtaking without cooperation of the car in front (in other words, you wait until the guy in front indicates to let you pass)
2) Yes, you will put more wear on the tyres & brakes, depending on how you drive (Im on my 3rd set of front tyres on the Cup after 14k miles, but I do a lot of track miles). Thats the price of having so much fun on a track.
3) If its wet itll be more challenging and fun getting oversteer in a FWD car, and the tyre/break wear is minimal.
Guess its all done to personal choice, my suggestion would be try one, that way you can decide for yourself.