Thanks. This is for my phone. It's meant to have 14GB free, but files are corrupting and it's now acting read only on both the phone and PC. Similar thing happened with the first card (got from a registered business seller on eBay, the postie delivered it to someone else entirely so I got a replacement, then the person got back from holiday and gave me the card so I had 2).
I have h2testw and I kind of remember using it with the first card after it corrupted but I can't remember if it took too long or what. I bought this card in like 2022.
Apparently Kingston cards are meant to have a hologram on the back and neither of mine did.

So I'm assuming it's fake
Also I've heard that Amazon dumps all their stock in the same bins as "fulfilled by Amazon" third party stock, so you never know if you get official stock or fakes.
I've had to end my boycott of Argos (they sold me a faulty tablet in 2017, refused to refund it, sent it for repair and I never saw it again) in order to maintain my boycott of amazon (into my 6th year!).
Thanks for the info, I'll order the card :)
Edit: https://www.argos.co.uk/product/2001447?clickSR=slp%3Aterm%3Asandisk+wd%3A9%3A92%3A1
This is what I'm thinking of getting. It's for photos and mp3s on my phone.