Thanks both, I just double checked and it looks like all Cube bikes have QR hubs.
Unfortunately, as I'm buying through Cyclescheme (this is a work perk), I have to buy new from an approved store (and not all accept the scheme), though there are some big tax benefits for me doing it this way. That's ruled out anything secondhand. I have taken on board what you have both said, and really appreicate the advice. Having a (slightly) better idea of what to look for, I've searched for a few options with some reasonable discounts on them, and I'm now considering the follwoing 2 bikes as possibilities;
£800: Giant Talon 1 (2025): SXC32-3 RCL Forks (100mm, coil), Cues U6000 1x10, Maxis rekon race Thru-axles, 2 position dropper post (30.9mm), Tektro HDC m275 (180mm/160mm)
£600: Voodoo Bizango: Suntour Raidon32 Boose (120mm, Air), Cues U6000 1x11, Voodoo thru-axels, 31.6mm seatpost, Shimano BR-MT200 (180mm/160mm)
Am I heading in the right direction, taking into account the limited budget? Thanks again for taking the time to help out!