Why can't you request No Claims Bonus proof from my previous insurer?

Car

If we have asked you for proof of your No Claims Bonus (also known as No Claims Discount), you may need to go back to your previous insurer to obtain it. Unfortunately we are unable to request this on your behalf due to data protection laws.

Acceptable forms of proof would be a copy of your renewal invitation, cancellation notice, or letter from your previous insurer which shows your No Claims Bonus entitlement.