You can grab yourself a totally free calendar from WHSmith, simply by using a code available on O2 Priority. The code is activated using the O2 Priority app and you'll have to make sure you are near a store when you activate is as you'll only have 15 mins to use it.
O2 often have some really good offers and freebies that are available to their customers, all you have to do is download the app and you're ready to go. I would say be quick with this one though, as I am guessing the stock levels won't be that high on the in demand calendars like, 1 Direction and Frozen.
You only have 15 mins to redeem the code, and it can't be a screenshot as the staff won't accept it. Offer code is valid between November 14th and 23rd at participating stores.
Thanks to BigPlonker at HUKD