Theres lots of things with classic insurance though...some general rules...
Not your primary car
Up to 6000miles
Kept locked up
Own another car that is insured in your name (motobike and public tranport for commuting dont count)
And loads of other weird and wonderful things lik £15K+
Obviously these are just general and companies will have their own policies
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold