I've never had to do it, but I don't see why they shouldn't just refund you, although they'll probably make you wait. Bare in mind when you agree to do insurance monthly you are effectively getting a loan from the insurance company. It also has the advantage that if you were to miss a payment you get a snotty letter from the bank and a fine instead of having your insurance cancelled. I relise it's not worth the effort for you because the saving would only be about £30. But when your insurance is in four figures and the insurance company are charging 20% the saving will be £200.