I think most tv's nowadays are so called smart, the problem with a smart tv is that you can only download the apps the manufacturer of the tv is prepared to develop and share,
when you buy an android box, you can have any app you will find in the Google store, and believe me, that makes your tv a lot smarter then any smart tv out there, all you need is a tv with HDMI, and nowadays every tv has at least one HDMI.
if you want to watch BBC and ITV you don't need anything else, you can watch them on Filmon, even in your browser, I watch BBC on Filmon everyday when I'm in Spain, in my browser full screen, my internet connection is only 6 Mbits, that's moren then enough for Filmon.