Probably this, 55" Samsung Q95TD for under £600
Obviously, their Neo QLEDs are brighter but cost a lot more as well4K AI Upscaling with Quantum Processor 4K Wide viewing angle No distractions with One Near-Invisible Cable & No Gap-Wall Mwww.hotukdeals.com
Samsung QN90B if you want this years model or save quite a bit and go for last year's QN90 95 or 94A models.
They are all 'Neo LED' models with lots of brightness to work in environments with lots of other illumination.
If the prices of thoose are too rich a Q80a for about £700 in 55 inches would be my choice for such a room.
I’d settle for the cheapest. It’s a kitchen/diner TV. You’re not gonna want to watch hours of telly and movies on it are you? Just a bit of casual viewing while you cook and eat dinner or whatever. Don’t need all the fandangles.
Mind you, that Q95TD for £600 is a great deal. That’s got 2000 nits of brightness. Retina searing stuff.