Daz-Tyler, I'm afraid it will be alot. These are very stealable bikes and with you being 17 on a provisional licence ..... You had best make a few calls before buying one.
I am not even sure you can ride the Aprilia on a provisional licence 'cause even standard they are very close to or even exceed the power to weight limit imposed.
Best check it out.
Sorry it's not good news.
Martyn