Do wheel spacers and longer wheel bolts count as a modification that an insurer needs to be told about?

My grandson has fitted spacers and longer wheel bolts to the rear wheels of his BMW 320d. Will this infringe his insurance if he does not declare this modification?

Is adding a fourth brake light and extra DRLs considered a modification in insurance terms?

Is adding a fourth brake light and extra front DRLs considered a modification in insurance terms? I can see how adding alloys or other performance modifications would increase the insurance premium, should...

Do you have to declare a mobility steering wheel knob as a modification to your insurer?

A friend is disabled due to post-polio syndrome and recovering from a recent fall. He has a Toyota Yaris, automatic and would be able to drive it, if fitted with a steering wheel knob. However he is dubious...