In reply to Indy:
Last time I did this I seem to remember them doing 2 transactions and them asking for both amounts or the last digit of each. They/it may have gone into the "pending" transactions area of your statement rather than as a fully cleared charge. I think when I did it the 2 payments came from two separate charging centres about an hour apart.
You can pay for paypal items straight from your card I think without it going through your paypal acct. Log out of paypal and try clicking pay by paypal and not selecting to use or create an acct. I seem to remember doing that recently on my tablet that didn't have my details stored.
Post edited at 16:39