To promote their new digital photo print service Carphone Warehouse is giving a credit for 25 free 6x4 prints and free shipping if you register for their service.
It's all free and there is no catch, just register your email address and upload your photos! I just did mine and submitted an order which came to £0.00 with 1st class shipping. Not bad!
Code: CPW-2K7E43M
Where: www.carphonewarehouse.com/photos
How: Register with your email address and create an account with promo code CPW-2K7E43M. Sign in. Upload photos and checkout. The credits and free shipping will be automatically added.