OK, below some quick tips on how to order from amazon.de:
1. Click the link on page 1
2. Click the button "In den Einkaufswagen" (add to basket)
3. On the next page, click on the button "Zur kasse gehen" (proceed to checkout)
4. On the next page, log-in with the same log-in/password from amazon.co.uk (select "Ich bin bereits Kunde und mein Passwort ist:" and click on "Weiter")
5. From the address book, select your address by clicking on "An diese Adresse versenden" (send to this address)
6. On the next page, leave everything as it is (the credit/debit card information from your last purchase should be selected) and click on "Weiter"
7. Last page: you don't need to change anything here, just review the order and click on "Bestellung abschicken" (confirm order). There is only 1 delivery method available on this page, so you don't need to change anything. Delivery cost is 6 EUR for most EU countries, including the UK.
8. Sit down and relax, it should take about 2 weeks for your item to arrive.
In the meantime, you can vote for this deal, or buy some games for your new XBOX 360!
Courtesy of alien7. (t0mm did not write any of the above.)