The Philips HS320 are brilliant earphones. They are available at Argos for £9 (with a one year guarantee), but I've found some on eBay for £6.50 (with no guarantee).

The only thing that I can pick fault with is the fact that they do become slightly uncomfortable after wearing them for about an hour, but all earphones are like this to a certain degree.

Go and buy a pair now. You won't be disappointed.