He's 28, says so in the first post mate.How old are you?
Only 1 years no claims?
I'm guessing your under 20? If so, I really doubt your get insured on ANY Skyline.
£12,500 is WAY overpriced for a GTT, expect to pay around £7-8,000 for one.
Does it have to be a 34? An earlier GTR would cost you a lot less than a 34 and would be far better than a 34 GTT!