Why not go the whole hog and get another tube based analogue set?
It might but if it does who cares? You can get a Google chromecast for £40 or a DIY Raspberry Pi for less and play around to your hearts content with whatever new goodies come along. It is virtually certain that all new smarts will plug into USB for their power and HDMI for their delivery of content to the TV. Set top boxes are now dongles.
One minor catch if you are used to running TV line out through your main hifi is that you will also need a digital to line out converter.
Luddite without a shadow of a doubt.
However, when I saw the thread title I though it would be about the newly reported security vulnerablity of the smart TV targeted content:
Or in more detail
Take a look at Richer Sounds vs Amazon to see if they have one that meets your needs. Freesat is a bonus if you can get it included as well and don't consider buying one now that can't do terrestrial HD TV. I reckon you need at least a 42" set to benefit from 1080p HD resolution.
If you have the room remaindered large sets can be more heavily discounted but check reviews carefully to avoid buying a lemon.
Active 3D is a waste of time unless you enjoy headaches. I haven't tried passive 3D but expect it to be similarly gimmicky but without the peripheral vision flashing annoyingly. It was fun to watch hawkeye ball flights on Wimbledon last year in 3D but the novelty quickly wore off.