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Seem to be a zillion options genuine Apple is £20 generic from about a fiver does it matter as long as it's got the right connections ?
Non genuine ones often don't work and if they work now they often stop worked when Apple do a firmware update (this applies to the newer lightning connector rather than the old style one). At least that's been my experience!!
Aamazon Basics is a good compromise. Not too expensive and keep on working.
https://www.amazon.co.uk/AmazonBasics-Apple-Certified-Lightning-Cable/dp/B010S9M3L6
Echo Rockhopper's comment- my $1 DX cable stopped working after the last iOS update. The Anker brand cables, with woven cover, have lasted better than the Apple ones.
I can recommend these.
[url= https://www.amazon.co.uk/gp/product/B00UBLKS6E/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1 ]Lightning Cable[/url]
Chose wisely and you will save money (edit Anker recommended above, their batteries are excellent so a good company ime). Our Apple ones last 3-5 years so even if the knock offs last just 1-2 you'll be better off. We buy only original as we think they are worth the money.
The Apple ones are a bit pants. Belkin ones seem to last well.
Non-Apple-approved third party ones will produce an error message when plugged in.