I have been told that the PCR test I have signed up for will show as negative with lab codes but there will not be a QR number, does anyone know anything more about this complex issue for transiting LHR, is a negative result OK or does one need a QR number also?
I'm not sure if this will be helpful for GB, but the process seemed similar to what Hawaii's been requiring. I've been to Hawaii a couple time in the last year. I needed to do a PCR test, upload it to Hawaii's safe travel site, answer a questionaire AND THEN a QR code was generated. The QR code did not come as a result of the COVID test result. The QR code was necessary to get into Hawaii and to rent a car or check into a hotel.
From what I’ve read about PCR tests they either come back either positive or negative. PCR tests are the most accurate.
No requirement for a QR code just documentary proof of a negative result, either a paper copy or e-mail/text. You also need to fill in a passenger locator form https://www.gov.uk/provide-journey-contact-details-before-travel-uk