Blackwood is due for release on DVD and VOD on February 23rd 2015. You can pre-order from many online stores such as Amazon and iTunes.
The DVD will also feature extras such as the Blackwood trailer, a Making Of feature, audio commentary from director Adam Wimpenny as well as the short film Roar (also directed by Wimpenny) starring Russell Tovey.
Finally! I have mine pre-ordered!