'Argo' movie in HD and a code for a Chromecast (NOT the 4k model).
Wuaki's deals don't seem quite as good these days, but this is still a good price for the non-4k Chromecast, even without the movie (which, for what it's worth, I remember enjoying a lot when I saw it in the cinema!)
If you're unfamiliar with Wuaki's Chromecast deals, the way this works is you buy the movie from Wuaki, and they give you a code to redeem against a Chromecast at the official Google store. I believe this includes free UK shipping.
In theory there is limited stock (550 units) and I've seen at least one comment in the past where someone had problems with a similar offer, but generally people don't seem to have any issues getting their Chromecast.