so here's the deal:

my mate has a brabus tuned 2013 merc gl350, it's worth in the region of around £60k, but insuring it is a nightmare as most companies won't touch it and those that do are quoting him in the region of £6-7k

i'm not sure if he has business miles on it but he's only done around 9k in the year or so he's had it

all the quotes he's had state that he lives in a postcode where merc's are the most stolen cars so how do i find out if this is true or not?

and are the figures he's been quoted a reasonable ballpark figure for a UB postcode price tag?