When I came back from Glasgow I unfortunately found that my iTunes account had been "hacked". I had a couple of email receipts from Apple telling me that most of the money in my account (from a gift card) had been used to purchase poker chips for a Texas Poker game by some company called Kamagames Ltd.
Seems I'm not the only one and this has happened before to others.
This is just a warning to anyone else out there with an iTunes account. Hopefully Apple will sort things out (they haven't yet).