Skip this generation. These are severely limited bedroom desktops for kids. The design and colour range should tell you as much. I understand you want to believe in M1, but this gen M chip is not the gen to spend £2000 on. 8Gb standard, 16Gb of memory max, not upgradable ever. Only four ports (two on base model). No SD slot. No ethernet (yes, I know there is an option in power brick, but WTF wants ethernet in power brick, WTF wants power brick in the first place in 2021?). And it's the same severely limited, iPad tech chip second year in a row. Don't fall for marketing. It's a step backwards in usability from outgoing iMacs and everything in it is exactly the same **** you can find in four of five devices by now - the only difference is that this one is the most expensive.
If you're going to spend £2000, spend it on something that will have some use in five years time. iPad with large screen and 16Gb of RAM is not that.
If you're going to spend £2000 on a super thin desktop, don't spend it on something that from a get go will need twenty dongles spidering all over your desk. Most of the devices you already have or own that you can think of - or share with your friends, coworkers and family - drives, cameras, USB sticks and portables in your drawer or your bag - will need new cable, new reader, new dongle or new device. It's a chore. And it's unsightly, you bought a clean, neat, thin desktop just hang some third party tat off it.
If you want M1 now, because of on-chip accelerations, but a mac mini. It will outlast any other first gen M1 machines and you'll find a use for it when it's superseded. Very soon.
If you want thin desktop get a used iMac Pro or 27" iMac - it's the same price, thin enough, and it will do everything such desktop does just as fast as M1 iMac, with less proprietary hassle and outlast it and keep being upgradable for years.
Don't feed the trolls chopping off features from your machines. Vote with your wallet. Just my two pennies worth of moaning.