i insure mine ( a d22) with gladiator insurance, find it online. I struggled because my missus is only 21 (and if I am honest its actually her car!!!) thay said no problem and it seemed very cheap compared to the astra sport hatch sri she had before.
I got a brilliant quote from a Navara specialist (they were cheaper than budget for me by £300). Obviously, check out the cover etc yourself but it seems good. A plan insurance 01707 649966. (Gavin Cox is who I spoke to).