$4K a year for insurance?!?
I love my Z but it's not worth double whatever price you're looking at - that insurance cost is damn near what my monthly payment was on a brand new Z.
Tires are what surprised me. I could barely get 6 months out of a set rear tires. Spent probably close to $1800 per year
Not to mention mods. This car is not cheap to own or work on. Small numbers mean limited aftermarket part options and specialty shops that know the Z well are few and far between for the most part. Can't imagine the UK is any better off than the US in that regard.
FWIW, I traded in a 2000 Nissan Sentra base model for the Z. Think it was rated around 120 hp (at the crank) lol