lft proof of negativity at port/airport

[Chichiboo]

so am i being dim but do you just take your negative lft with you and show it to whoever.... my daughter has only had one vaccine and we fly to barcelona in a couple of weeks time so she has to show a negative antigen test but how do we prove its negative - i mean whats stopping us from doing a test now it being negative and taking that one with us as opposed to one done 24 hours before if you see what i mean??

Dont you have to use the ones with a verification to fly?
lloydspharmacy.com/products/fit-to-fly-lateral-flow-test-kit-with-verification-service?currency=GBP&variant=39547708178495&utm_medium=cpc&utm_source=google&utm_campaign=Google%20Shopping&gclid=CjwKCAjwwo-WBhAMEiwAV4dybQxocpzj7EA5DSi1-_alj9fAkwXSOu19MMPJB20JHDAxXiNSW8NMShoCgCcQAvD_BwE&gclsrc=aw.ds

You have to use one from a specific company. They provide you with a QR code which you show

Try randox

We used DAM Heath and they were great. You go to a place for a test and they
Email you results within 24 hours.

It has to be a recognised test centre, you can't just use a LFT. You can book online.

You need to pay a private provider and they will give you a proof of negative test