Hmmm.
I wouldn't claim any great expertise in such matters but there would seem to be a contradiction between Statement No 1:
>>>>I don't want to spend loads
and Statement No 2:
>>>>I am presuming that I would be best to get an Apple product
Anything from Apple won't come cheap! The only Apple iPod with a fairly low price tag is the iPod Shuffle, at £37.00 in Argos:
http://www.argos.co.uk/static/Product/partNumber/5190458.htm
It's available in 7 colours but it's only got a 2Gb memory (but, at around 500 tracks, that might be enough for an 8-year-old anyway).
Above that you're looking at spending quite a bit of money for a more advanced iPod. (Around £130 for an iPod Nano, £190 for an iPod Classic or between £250 and £330 for an iPod Touch, depending on the storage capacity).
If I was buying for an 8-year-old I'd be looking at something like this:
http://www.argos.co.uk/static/Search/searchTerms/9080210.htm
As well as holding far more tracks (around 1800) it's got far more 'play value' because of its built-in camera and video facility (together with an FM radio). If you scroll down to the customer reviews you'll see comments such as "Excellent purchase, bought for my 8 years old little girl, really easy to use, definitely worth the money."