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Thanks. Is around £75 a good price? This look ok?
https://www.ebay.co.uk/itm/Apple-iPhone-7-32GB-Jet-Black-Unlocked-A1778-GSM/184222937615?epid=239165248&hash=item2ae48af20f:g:tbgAAOSwtixeeKI1
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This is a 7, not a 6s.
A 7 would also be good, keep in mind though the 6s is the last one that accepts a 3.5mm jack, from 7 on it's lightning port only (so no charging while having headphone / mic plugged in, always need an adapter for non-lightning headphones etc.).
I'd spend a bit more but get a refurbished / renewed one, with a bit of warranty, like
https://www.amazon.co.uk/Apple-iPhone-6S-SIM-Free-Smartphone-Silver/dp/B0716RGCPM/ref=sr_1_7?dchild=1&keywords=iphone+6s+refurbished&qid=1585153802&refinements=p_89%3AApple&rnid=1632651031&sr=8-7You can get lucky with a used one from eBay but often they're quite, erm, "used".. meaning battery can be on it's last legs etc.
6s