Got the QR code on my NHS app working nicely containing all my vaccine info. Just a quick flash should get me in.
John Barrowman, I presume?
On a more serious note, the phone signal around the Amex isn't that great at the best of times, I dread to think how it's going to cope with 30,000 people all having to open an app on their phones in a window between about 14.15 and 14.45 on a game day (times may vary depending on stupid Sky schedulers).