You can buy them in currys if that's more convenient. I did that last time my cable went up in a puff of smoke, Apple store meant a ride out to kingston and I could walk to currys....so that was the easier solution.
Of course, the environmentally friendly thing for apple to do would be to make the actual lead magsafe at both ends so that the cable was "consumable" because they (as you're read) are crap.
Deeg Does it look like this?
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And aren't from Derby? If so you can have this one. I'm a Reception Manager at a hotel in Castle Donington and this has been in my lost property box for months so you can have it for free as long as you can collect it!