Apple has expanded their "Reuse & Recycle" program to letting iPad owners overseas trade in their old, unwanted models for store credit. The program will operate in the U.K., France, Germany and Spain exclusively in Apple stores. After a successful introduction of the "Reuse and Recycling Program" for iPhones in the United Kingdom, this was a logical next step for Apple. The program is already available in the U.S. and Canada.
The trade in program applies for older devices, including the iPad 2, iPad 3, iPad 4 and first-generation iPad mini. The current model iPad Air and iPad mini aren't eligible.
As for the credit you can receive in the trade in process, there is not a publicly set scale. The trade in value will be based on the model of the device and the condition in which its kept. Still, even a first generation, cracked screen mini will be worth something, and the money might come in handy after Apple unveils its next round of new gadgets.