cordshoes What I'd do here is search Richer Sounds for 50" or 55" LCD TV's. OLED if you can stretch to that.
A few things:
1) The difference between 50 and 55 is 2.5inches on each corner as the screen dimension is diagonal - you may be able to fit a 55" more easy than you think.
2) Richer Sounds have a 6 year warranty.
3) I believe (based on selling to them in the past), that the Richer Sounds are selling the 'previous' model. This shouldn't matter at all. I've bought a lot of audio kit from Richer Sounds and have never had any problems. Good company to deal with.
Find a model you like and search for it on What Hi-Fi or AV Forums.
This 55" OLED model is just over £1K - https://www.richersounds.com/tv-projectors/55-59-tvs/lg-oled55b9pla.html
Here's the What Hi-Fi review: https://www.whathifi.com/reviews/lg-oled65b9pla
Here's the AV Forums chatter - https://www.avforums.com/threads/lg-oled55b9pla-or-philips-55oled754.2259814/