Here is some crucial advice which is surprisingly missing when people recommend TVs. Since you are buying new and you have a reasonable budget it's a given that you will be buying a 4K TV. Therefore by far the most important factor comes to the HDR standards the TV supports. There are a number of different HDR formats, including HDR10, HDR10+, Dolby Vision, and HLG. HDR10 and it's newer version HDR10+ are the most common ones which most TVs support since they are royalty free. HLG is less taxing in the encoding hence why it's used by Sky and the BBC for live 4K HDR transmissions (usually sports). However Dolby Vision (DV) is a more advanced format that offers some additional features, such as scene-by-scene mastering. Most premium content uses DV. Since DV is not royalty free is usually missing on cheap TVs. But crucially Samsung has no TVs that supports DV. So to me anyone buying a Samsung 4K HDR TV without DV is making a huge mistake.
So get your hands dirty and research the models you want to make sure they support the 4 HDR standards since you can't really predict what HDR standard your content will use so it's best to have them all 4 specially since a lot of people say they grade HDR more visually impacting than 4K. In terms of streaming boxes I totally agree is best to leave the TV unplugged and use a 4K streamer (ie Chromecast/Fire TV/Apple TV). Personally I think the Apple TV 4K is well above the rest.
The two LG models you linked only support HDR10 and HLG so I would NOT recommend them. The LG 55QNED756RA £549 is cheaper on
AO.com at £397 and the LG 55NANO766QA £449.99 is cheaper on
lg.com at £399 so I while I got nothing against Currys I find that they tend to sell outdated stuff at inflated prices.
Personally I would highly recommend the LG OLEDs as the image is stunning and most if not all support the 4 HDR standards. You don't have to go for the latest models and while 2022 models are now usually not available the 2023 still are. I did a filter for the cheapest LG 55" OLED and the LG OLED55B36LA came first. Cheapest price I found is
£850 in Amazon UK sold by
Hughes Electrical, which is a proper retailer (ignore the 4/5 reviews on Amazon as this isn't the original TV page, seems like a new separate product page added by Hughes). Or if you prefer to buy direct from
Hughes you can get for £899 (see extra 10% code on product page) with 5 years warranty. Now it's a great time to buy as the 2024 models are introduced the 2023 models are discounted and still with good stock. Also there are offers for the EUROs like Hughes 20% of all LG TVs.
I know £850 is £300 more than you were going to buy but trust me you will not be dissapointed with the LG OLED TVs. Once you see the blacks in OLEDs (you actually CAN'T see them as they are actually 100% black) you will not want to go back. And the added stunning colours by DV makes it a total winner.