The New 4th Gen ipod Touch is £249 but i noticed after a little digging on the apple site that if you go and take in an old ipod to get recycled at the Apple RETAIL store then you get 10% off a new ipod ( Except Shuffle).
This makes the new 8Gb 4th Gen touch £178.1 instead of £189
The 32Gb 4th Gen Touch £224.10 instead of £249
The 64GB 4th Gen Touch £296.10 instead of £329
Can't find them any cheaper than that online or anywhere :)
Link to recycling page here: http://www.apple.com/uk/recycling/ipod-cell-phone/
Note: The 10% discount only applies to recycled ipods.