I would thoroughly recomend either course.
The escort for sideways fun, or impreza to be brutal with a car.
The set out course is gravel on a concrete pad (very large) with road tyres on the car, therefore very slippy.
When I was there Egg & Vauxhall were testing the latest BTCC cars on the run way, stopping every now and again to let planes land.
So, rally car instuction, BTCC cars & Prodrive testing all in one area.