From the website:
These offers are for the Christmas period, and extend to 3rd January 2014.
For a guaranteed Christmas delivery, please place orders by Sunday 15th December.
We will continue to process and ship orders until the 20th December (though these orders are not guaranteed for delivery before Christmas - though we will do our best!)
From 21st December to the 6th January 2014 Hawk Wargames will not be dispatching orders, however any order placed will be honored and dispatched as soon as possible from the 6th January.