I found this on Discord (https://discord.gg/9HV2C6x), by tauceti:
Video tutorials for ZX Spectrum Next Z80 coding? Keith, from ChibiAkumas has published one today. He seems to have a great interest in older systems and assembly language. Give him a few likes and views and he'll probably will do some more:
This section is for discussing everything about Next hardware and latest updates.
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That does look useful. Thanks for the link!