Don't worry, your learner driver insurance will have no impact on either parents' or the car owner's insurance policies. Dual insurance occurs when the same items are insured against a certain risk under more than one insurance policy.
Our Learner Driver Insurance is a temporary risk policy, providing cover for drivers who hold a provisional UK licence and are not named in the main insurance policy covering the vehicle. Therefore, it doesn't cover the same risk as the main policy and doesn't constitute dual insurance.