I think my nephew has paid well over £1000 for all the tests for the two of them. Test before you leave (Vietnam is virtually Covid-free and they've had no restrictions on movement, even in the capital), then tests booked through an approved UK-provider on days 2 and 8 of your self-quarantine. He's also paid for the extra test on day 5, to get early release from quarantine - but even if that's negative, you still have to have the test on day 8!When my son had to fly from the US to Croatia in the middle of last year you had to have a test conducted in the last 72 hrs to get in to Croatia and maybe to transit through Germany. Given the flight time and the normal 2/3 day turnaround for tests at that time we had to pay US$200 for a 24hr express service or it was impossible to comply.