my oldest needed the NHS C19 Passport for going to Uni freshers stuff, they were doing 2 coloured wrist bands, one if you had shown the passport, the other you needed to show.a LFT result in the last 24 hours, of course people who hadn't had the 2 jabs were just scanning the QR code on the LFT and clicking Negative, the text came back, job done

as it goes, the turnaround for the NHS one was about 24 hours, took a pic of her passport, said a few words in the app and was approved the next day, all pretty painless