Quick experience of NOT using VeriFLY in case it helps anyone
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It seemed like too much hassle to sign up for yet another app for the only flight currently planned since we had to use a desk to drop bags anyway. All went fine at CE desk. Agent with probably too many countries to juggle had a quick look at printed NHS COVID passes and proceeded to do bags and BPs just like normal. Felt like a bit of a win not to be juggling one more phone app.