I missed all this.
DX335d - is it not your car then?
Spirited driving is all well and good .. we were all young once.
I for one did 120mph in my Ford Cortina 1.6
But the roads were a lot quieter in those days and I didn't have access to a real performance car. Good job too, because I wasn't half as good a driver as I thought I was at the time.
Just stay safe and if you want to really go for it book yourself a trackday or a day at 'Palmer Motorsport Sensation'.
I've done the palmer day twice and I learned a hell of a lot about really driving at the limits of a car. Enough to know that only an idiot would do it on a road.