Hey, i really need some headphones for my amp, anything up to 30 pounds (i live in the uk), i need a link to an internet site, can't any on eBay and not looking to buy from an individual
If you can, and a little bit of sound leakage isn't an issue*, try and get some open backed headphones. Much more pleasent sounding, and a bit less harsh on the ears in terms of hearing damage.

* In other words, you don't intend on using them with a separate mic for voice comms when not playing the guitar...
Oh, now I've gone and spilled my tea. This really won't do at all.