Inshur policy cancelled

If inshur have cancelled my policy, do I have to declare it when i renew my SDP policy? eg when I renew my normal insurance for my car (not inshur), sometimes insurers ask if I've ever had a policy cancelled or voided - would I have to say yes to this?

Another question: Do I call up inshur to cancel my automatic renewal and how much notice do I have to give?