Agree - I've raised the issue which shows I'm aware. They have a record of this so if I do intend to go over the allowance then I'm going to pay the premium.Insurance contracts are unusual in that, unlike most other contracts, they are additionally (beyond the basic three principles of offer, acceptance and consideration) also based on ‘good faith’ ie. telling the truth.They have to be, as no insurer has the ability to check that each of their customers is telling the truth.
Setting that distinction to one side. It is incredibly difficult for an insurer to invalidate a motor policy after the claim event, unless there was deliberate and intentional non-disclosure (in simple terms, lying) by the insured person, when the application for insurance was made. To void the policy, after the claim event, the insurer would have to prove that their voiding of the policy was fair and reasonable in law and by common practice. This is particularly true of the third party liability section of the policy, the only part that is compulsory by law.
Whether the OP should or should not have declared his ‘over mileage’ to his insurer is now irrelevant. He’s done it and he knows the result of his disclosure.
I'm just surprised at the amount (50% of the original premium) and the change in excess.
The price tag of being honest....