What information must be supplied to the Secretary of State when an insurer refuses to insure a motor policy due to the proposer's health?

The requirement to supply the proposer’s name, address, sex, and date of birth is correct because this information is essential for proper identification and record-keeping purposes. When an insurer refuses to provide coverage based on health reasons, it is vital to report specific details about the individual involved to the Secretary of State in order to maintain accurate statistical data and compliance with regulatory obligations.

This information enables regulatory authorities to track trends in motor insurance refusals related to health issues and ensure that insurers are operating within the legal frameworks designed to protect consumers. It facilitates a clearer understanding of how many individuals are being denied coverage for health reasons and allows for oversight regarding the practices of insurance providers.

The other options, while potentially relevant in different contexts, do not specifically meet the requirements set forth for reporting refusals due to health reasons. Details of other policies held by the proposer, the rationale behind the refusal, and health records all involve more sensitive personal information that is not mandated for reporting in this specific circumstance. The focus is instead directed towards the basic identifying information of the individual who has been affected by the insurer's decision.