I'm travelling to Belgium next week from the UK on the Eurostar. According to the current guidelines, I need to have a negative RAT (lateral flow test) on the day of travel, but where is this checked, and what proof do I need?
Is the text/email (example below) from the NHS enough, or do I need the physical test, or something else?
The rest of the testing requirements are clear enough as PCR tests are done at Belgian test centres.