Just thought I'd share if people are travelling soon.
Leaving the other European country, it was a bit of a faff having the pre-departure LFT paperwork plus Covid pass plus passenger locator form to scan. I definitely recommend getting everything printed out, such pain worrying about my phone.
However back in the UK (England) they'd merged all the digital records so we just had to show passports.
Took my return PCR at the airport and hopefully get a result soon.