Question Author
As titled, the question is hypothetical – however the facts are correct up until the notification to cancel the insurance was in my junk e-mail folder (and I did not see it).
I did see the e-mail and contacted my insurer to point out that we (the insurer and I) had entered into a legally binding contract – and that they could not cancel the policy because they had subsequently discovered a mistake on their part.
They refused to accept this, and confirmed that unless I paid the additional £150 the policy would be cancelled – they also pointed out (as you said) that when obtaining any insurance in future, I would have to declare that I had had an insurance policy cancelled by an insurer.
But had I not read the e-mail from the insurance company advising me that the insurance would be cancelled, I would have been driving with no insurance – there was no guarantee that I would read the e-mail not in my junk folder – given the amount of junk e-mails in my normal folder.
You may say, well it never happened, but I could have been involved in an accident that was my fault, and being uninsured, faced potentially unlimited liability.
To me, the insurer’s actions were totally unacceptable; under contract law one party cannot cancel a contract due to a mistake they have made, which is what the insurance company threatened to do.