Noticed this aswell as the beer today, buy any iPod nano and get a free £25 iTunes card. 8GB or 16GB, i only caught the price of the 8GB and it was £115. So deducting the price of what a card would usually cost, your looking at paying around £90 for the iPod Nano.
I just read the paper too, and it says in there that you can also buy one £15 iTunes card and get another half price. So that making a £30 iTunes card comign to a total of £22.50. Great if your going iPod mad this christmas.