Hi Jack,
I've mentioned this little scam a few times on here, the Scam of Loaning the Payment Protection Premiums and charging interest on them should be illegal. But as far as I can tell, it's done by more than a few lenders.
The practice of making customers believe that Payment Protection is a condition of the Loan should also be illegal. Even knowing that it was option I was recently strongly led to believe that I HAD TO have it when switching Credit Card. I really had to stand my ground to avoid it.
Good News
Yes you can cancel the payment protection, You may have to send them a letter saying that you want it cancelled.
Bad News
You won't be refunded the full premiums. They've got their hooks into you for the Premiums by loaning it to you. With any sort of Insurance you should be able to cancel and simply stop paying the premiums, but since they've effectively taken all the premiums up front you will be in the situation of seeing how much they'll reduce your loan by.
I tried about a year ago to get one of the Banks to Explain how they calculate the refund if Payment Protection is cancelled and they couldn't, they simply said it was worked out by the computer.
Upshot is you will be dissapointed by how little you get refunded, but it's still worth cancelling. And now that you've learned this valuable lesson, you'll never fall for the Payment Protection Scam again.
Sorry I couldn't be more uplifting.
-Rd