Liquid, if you haven't bought any headphones yet I recommend the Sennheiser PX200. Been using them on my bus journey to work and they're great. Really comfortable and the fold neatly up as well. They're about £30 I think.
I'm pretty confident this will be a bit late, but..........
The PX 200's that I'd also recommend are normally about £40, although after visiting the What Hi-Fi show where they'd run out of them on the Sennheiser stand, I went to Tottenham Court Rd. I told them that I'd seen them elsewhere for £30 and they said they'd match it.