Common mistakes include entering inaccurate details about your address, occupation, annual mileage or how you use the car, as this could affect whether a policy is suitable or valid. People also sometimes forget to declare modifications, regular drivers or previous claims, or choose a very high excess without checking whether they could afford it. Comparing only the cheapest premium can mean overlooking cover limits, exclusions, courtesy-car arrangements and breakdown cover. Check each quote carefully and confirm any uncertain information with the insurer or an FCA-authorised provider before buying.