I just have found this on the Cunard website. I will copy below as written apologies for how it appears
Please note, testing facilities will not be available at the cruise terminal.
The following formats are acceptable proof of a negative Covid-19 test:
For Lateral Flow results:
One (1) photo which shows all together, the Lateral Flow negative test result, government issued photo ID (such as your passport) a clock displaying the time (e.g. a watch, mobile phone, wall clock) and date of testing written on a piece of paper.
For PCR results:
The text message or email received from the relevant laboratory or health authority which confirms the Travel Covid-19 PCR test result.
Ensure that you have the relevant proof with you as you may be asked to show it.
It this actually a joke? Has the Cunard site been hacked?
I take it you can't show a paper printout? I cannot do email as I don't really have the i phone and I am not risking losing my email address for it. And I don't think a txt message on the old pre paid burner track phones are what they mean?