We have three cars all insured with different insurers and recently moved approximately 16 miles. No other factors have changed and two of the insurers agreed to the change of address with no material premium adjustment, one actually went down marginally. The third policy, which is on an elderly Lexus RX400h has more or less doubled. I can't understand how there can be such a discrepancy in approach and can't get a sensible explanation out of the company involved. Any thoughts?