A simple way to be sure aside from having QR codes printed (belt-and-braces)
IMHO, keeping things European, would be to download the French TousAntiCovid app onto your dog 'n bone and use the app to scan all your QR codes.
If valid and successful, the app will make a 'confetti shower'.
Sorted. Happy travels EO
p.s it is worth knowing the current UK legislation, IF you wish to return to the UK:
is to have an independant covid flow test booked- Eurotunnel/ferries will ask you for this code number when you make your booking and it is issued by an approved tester once you have bought their day2 test kit and without may refuse you.
I've not tested the 'going only one way scenario'-
The only constant sound I seem to have been able to hear is the gentle hum of politicians going about feathering their own nests... 
Covid rules appear to have the horizontal hold of a fruit machine.
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