I have one of these things gathering dust at home:
I have the original manual (when I find it?) too.
It did work, the last time I powered it up, 35 years ago.
Should I throw it in the bin or sell it?
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Ebay have a special category for retro computers There is also the UK based https://www.sellmyretro.com/ were you can try to sell it. I am sure that most countries also have their local sites where to sell things like this. Also, serach the web i your local area for Acorn user groups. Even if they probably are more into the slightly newer Acorn computers, there is a big chance at least some one there is interested in a Acorn System 1 to get a complete set on the shelf at home.