Why caution is needed with lateral flow tests

This story has info about how passengers were turned away from boarding their flights. Some of them had had the type of tests that WERE on the airlines list.

www.independent.co.uk/travel/news-and-advice/covid-test-uk-flight-quarantine-heathrow-chicago-b1788742.html

My school were recently trying to book a flight to China for one of our students. He had to have a specific type of antigen test (there is more than one type). The type of test he needs to be able to enter China is not widely available. Even a doctor in the bigger hospital in the area didn't know where it would be available.

It seems there is so much variety in testing that there is no gold standard, which is available, and is standardised between countries. Very hard for passengers.

I meant LFTs were used on lorry drivers, etc.

I'm not sure. My understanding was that the government still hadn't decided a couple of days ago. They were the tests used on lorry drivers at Dover.

They're also the tests used for healthcare workers and the ones which the government wanted to use in schools.

I thought PCR tests wére need for entry to the UK.