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Wow, I seem to pick em don't I. Bought a Nokia 920 in February on the basis that I could have Skygo as a swappable with EE. guess what?, NOT SUPPORTED.
Swallowed that. Bought an Xperia Tablet Z on EE, guess what? Skygo app not supported. On top of that, I have a library of Sony Blu rays that I OWN. Guess what? Ultrviolet not supported ON A SONY DEVICE?
Sony, large corporation, Sky, Large corporation. GET IT TOGETHER PLEASE.
WHEN?
It might be an exclusivity issue and/or a network/regional restriction, I have the Xperia Z, S, T and I can't install the app, then again I'm in the US
http://help.sky.com/tv/sky-tv-on-other-devices/sky-go-supported-devices
Sony: Xperia M, Xperia S, Xperia T, Xperia Z, Xperia Z1, Xperia Z Ultra, Xperia SP
https://play.google.com/store/apps/details?id=com.bskyb.skygo
http://www.sky.com/shop/offers/sky-go/sign-up/?DCMP=pac-SkyCOM:ec_skygo
what i can see with this app is they havent made it compatible for xperia z yet or tablet z so all you have todo is contact skygo about it and ask them if they got any plan to add support to these 2 devices if so then wait for that update to be out 
Update: hmm just checked the help.skygo link thats odd either they made app supporting 4.1.x for xperia z and tablet z? or something else sems to be wrong?