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Porlex is good, these are meant to be similar but less prone to the handle flying off issues that the porlex has.
https://www.coffeehit.co.uk/rhino-hand-grinder.html
Though I use a pentagonal drill bit for my Porlex so it's not been an issue for me.
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No one else here seems to like this one, but I've had zero problems with it in over a decade of use, including adjustments. I've used the Porlex and Hario and both are harder to use.
https://www.amazon.com/Zassenhaus-Espresso-Grinder-Havanna-041002/dp/B0013SRP2O
Thanks for the advice chaps - it looks like I need a grinder. Any recommendations? (Cheap is good, because student)