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?

My car was damaged in a private car park - do I have to tell my insurance company?

My car was parked in a private car park and I returned to find damage down the side of the car caused by the car next to it. The person concerned has admitted liability and is claiming on her insurance...