Oh well, perhaps it is time to buy that new TV
For my last few "TVs" i've really just considered them a monitor/panel and made a deliberate decision to separate the 'smarts' out from the panel. While I'd love a new 4K OLED panel, my 7 year old 1080P Sony LED TV is doing perfectly fine, and has used a Raspberry Pi, then an Apple TV and now an Android TV box (Nvidia Shield) to provide the smarts. Unless you want to be upgrading your TV every 1-2 years, this is the only sensible option, plus it gives me a lot more flexibility than whatever the TV manufacturer decides to do (or not to do).
"Smart" TV's are a convenience to a degree, but quickly lose relevance (and convenience). Something like an Apple TV is a great platform that pretty much anyone can use, is cost effective and can make even a 10+ year old panel just as 'smart', or often smarter, than the latest TV released.
Thanks, I have checked the list of devices you can watch Spark Sport on, and although Apple TV 4th generation is listed, Android TV Box isn't. So, if you're having to buy one of these, it looks like it would have to be Apple TV if you want access to Spark Sport. But, is Apple TV as good as Android TV box?