I was in Peterborough Hampton Tesco and came across this speaker. Can be used for ipods or any mp3 player supporting 3.5mm. I'm not sure if its Nationwide but all the reviews state its a good portable mini speaker. Some details below:
Boost the bass, turn up the treble, and deal out some major decibels by cranking this fab Mini MP3 Amp all the way up to 11!
Can also be powered by battery for times when you're far from a computer (or in the middle of a muddy field). Alternatively, connect to your PC with the audio cable and use as a computer speaker. If you wish you can power it from the mains with a USB to mains adapter (not included), to purchase one of these please see our related products below.
* Dimensions: 9" x 6" x 6"
* Requires 3 x AAA batteries (not included).
* MP3 Amp Unit
* 3.5mm to 3.5mm Audio Cable
* 1.5m USB Cable