Apple’s Reuse and Recycling Program (UK):

With the Reuse and Recycling Programme, you could turn your old equipment into a brand-new Mac, iPod, iPhone or iPad.Whether it’s an iPhone, iPad, Mac or PC computer, working or not, we’ll take it and determine if it qualifies for reuse and has a monetary value. If it does, the amount will be credited directly into your bank account. If it doesn’t, you can recycle it responsibly through one of our free recycling programmes.

Apple now has recycling programs in Europe, Africa and the Middle East as well as India, Japan, Australia, Brazil, Costa Rica, USA, Canada and other countries.

(CORRECTION: rewrote last sentence to make clear that “Europe, Africa and the Middle East” aren’t countries. Thanks to “YJ Soon” for pointing it out)