Given your limited budget I think you've made a fair choice yourself, potentially the best in that price range since it has £200 off the asking price. It won't be perfect, but you can't expect that for £500.
You should be able to turn all the crap off, but don't turn everything off. You need stuff like Real Cinema on and local dimming is a necessity with edge lit LED, just have a play around and see which setting you prefer. Low can sometimes be too little and high too much, but there's a lot of variation between panels even in the same range with edge-lit depending how much light bleed that individual screen gets.
Remember you'll have to do your tweaking at least twice with HDR TVs, once for SDR as you'd expect from any TV, but again for each HDR format the TV supports.
Cool, thanks What sort of tweaking is required for HDR and forgive my naivety but what's SDR?