Some insurance companies are charging ‘extortionate’ fees for a driver to change minor details on a car policy, a study by Which?  has found. The consumer magazine investigated car and home insurance company administration fees after complaints from consumers.It found that Hastings was charging customers £35 to change a surname on a policy, while Axa and Swiftcover were charging £30 for minor changes including transferring the policy to a new car or changing address.