I generally buy everything from a few places on ebay, like Kenable or VisioSound. But for metal adapters like that I don't think cheap necessarily means unreliable. I'd go for this: https://www.ebay.co.uk/itm/Metal-3-5mm-Stereo-Socket-to-6-35mm-1-4-inch-Mono-Jack-Plug-Adapter-003440/261401003895 which should do the mono to stereo you'll need for headphones, whereas the two you linked are stereo to stereo.
Thanks - I’d assumed that the phones out would be for a stereo connector but with the same mono signal into both sides. I’ve order the connector above
Hm, weird. Phones out should be exactly that, but at least this thing should help if it is mono for some reason.
@cookiemonster started
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I generally buy everything from a few places on ebay, like Kenable or VisioSound. But for metal adapters like that I don't think cheap necessarily means unreliable. I'd go for this: https://www.ebay.co.uk/itm/Metal-3-5mm-Stereo-Socket-to-6-35mm-1-4-inch-Mono-Jack-Plug-Adapter-003440/261401003895
which should do the mono to stereo you'll need for headphones, whereas the two you linked are stereo to stereo.