You can drive your own car for the test, it doesn't have to be the examiners, so bare that in mind if you have been using a different car at home to practice.
I use my instructors car. my brothers has a 2013 plate 1 series and is way to powerful for me. also my mum has a zafira which is way too big. i dont know anyone with a decent small engine car hence why i use my instructors