I called my insurace company the other day to declare the new grille and the spoiler that I now have on the car. They didn't give a stuff about the grille, but noted down the spoiler, and charged me £15. Not for the spoiler but for changing the policy details.

So, what do other people declare and how much does it increase the premium by??
Or more specifically, how much extra for adding a tuning box and changing for bigger alloys

Cheers
Paul