Streaming on your tablet is fine but you want to own an actual TV in the UK, you need a licence, whether you watch live TV or just use it for TV games is irrelevant.
I cancelled my TV license last year as i don't own any TV services (eg: sky/virgin), and, i don't watch TV as its being shown live. Our household only uses internet streaming, netflix and bbc i player (on demand).
The TV license "representative" who checked my property confirmed, you only need a license if you watch or record LIVE tv.
Even if you have a SKYbox or Virgin box, they would still need to prove your doing it before they can fine you.
TV licensing uses "scare tactics" in their methods. But the basic rule applies for everyone. You only legally need a TV license if you watch or record LIVE tv. Ondemand is not LIVE.
Just be aware that watching BBC i Player when the program is being broadcast LIVE does count as breaking the law without a TV license.