Can I drive someone else’s car on my own insurance in Northern Ireland?

Only if your policy actually includes driving-other-cars cover and you meet all of its conditions. Do not assume comprehensive insurance automatically gives this benefit.

In relation to “Can I drive someone else’s car on my own insurance in Northern Ireland?”, a sensible way to handle an insurance query is to separate the legal requirement to be insured from the contractual question of what this particular policy covers.

For “Can I drive someone else’s car on my own insurance in Northern Ireland?”, “Driving other cars” is a policy extension, not a universal feature of comprehensive insurance. Check the certificate for the exact driver, vehicle and circumstances covered.

For “Can I drive someone else’s car on my own insurance in Northern Ireland?”, for Northern Ireland, the key is to use the authority or contract that actually controls this issue. The sources attached to this answer include nidirect - Motor insurance explained, GOV.UK - Vehicle insurance, and GOV.UK - Uninsured vehicles. Those sources should take priority over forum posts or guidance written for a different jurisdiction, particularly where a deadline, offence, fee, finance right or policy condition is involved.

Practical next step: read the relevant line of your policy schedule and certificate, then ask the insurer a specific written question about the situation in “Can I drive someone else’s car on my own insurance in Northern Ireland?”. Keep the reply with the policy documents so there is a record of what was disclosed.