+1
I got my N900 ordered with 2 discount codes, also using Topcashback, mid-Oct.

A colleague of mine did the order, his bank is Nationwide. The card wasn't used in a while and because it was an internet transaction, the bank stopped it. He phoned bank and nokia and indeed Nokia says there is a change he gets his 30% off still. He would know by this evening.

Still unhappy on the 10% topcashback. But if I get the 30%, I'm a bit more happy ...