Save some more money, until you can spend around £70-80, and get a pair of Shure SE215’s, not only is the sound quality outstanding for the money, but they have replaceable cables, unmatched at the price, and if you want cables with a remote, instead of the £45 Shure ones, which have a habit of splitting, you can get cables from Ultimate Ears, for the UE900’s which are around £18, but you get shafted for £8 postage. Still famed cheap for a remote cable, mind.
Here you go, £63.99: http://www.eglobalcentral.co.uk/shure-se215-sound-isolating-earphones-black.html
And here’s the page for the UE cables, they’re actually £15, plus postage:
http://www.logitech.com/en-gb/promotions/6423
Also, use them with triple-flange eartips for best sound isolation and comfort.