Thankfully I never used those buttons. Those buttons have always looked ugly and took up space unnecessarily.
Looks like someone has nabbed it. Good price for excellent though
If anyone wants a 7 pro https://www.clove.co.uk/products/oneplus-7-pro-uk-model-dual-sim-nebula-blue-256gb-excellent-condition-unlocked?variant=39644592930859
Have you thought about trying Gestures navigation (Settings/Buttons & Gestures/Navigation bar & Gestures). You can always change back if you don't like it.
I wish it were the 9pro, but i think you mean the 8pro for 359£. Also, worth pointing out this does not seem to be the 5g version of the 7pro.