Umm, with that budget, good luck on that one.
Now if you want really good quality, go Bose Noise Cancelling Acoustic Headphones. They are crazy good (I love mine, perfectly silent). This may be biased being that I own them, but who cares? They are awesome!! Sorry, but for 70 pounds, there are not that many good headphones out there. I'll send a google spider out to search for a couple things on this, and my next post will contain at least one link that I feel may help you.