Cex is the safest place, it's probably not the best price compared to ebay or member's market but you can simply sell it online, drop it off at your local cex and you know you'll get what you were quoted within a day or two. I've used them every time. It's extremely little hassle and obviously with solid legal protections, etc. instead of some dodgy guy off gumtree who'd probably steal your kidney.
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