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Buying a spare FP2 battery (UK)

Hello, my FP2 is 5 years old. It doesn’t get a great deal of use, but I can no longer get a day’s use out of a fully charged phone.
I see that I can buy a spare battery from Fairphone, but have to pay 11.95 euros for post & packing - I’m OK with that if necessary, but wondered if anyone knew anywhere in the UK I could buy one? The phone co-op don’t stock them, and a search shows only ebay (not happy as so uncertain quality)
Thanks!