As of August 9, 2022, Princess updated the pre-boarding Covid test required for sailings from the UK. Here’s a quote from their website:
“Unless otherwise communicated, all guests ages five and older must take a viral COVID-19 test (PCR or antigen) within three days prior to embarkation on the ship. This can be done at any time in the three days before on the day of embarkation. Guests no longer need to provide a test certificate, however they will be asked to confirm that the test has been taken, with a negative result, as part of the pre-boarding health declaration at the cruise terminal/airport. Guests under five years of age are exempt from pre-cruise testing. (Please note that these updated guidelines apply to the UK but not to the U.S., Canada or EU).”