Mr. Muiris O'Connor:

Ms Canavan has covered most of the points. If a paper certificate lands in a person's home in the coming week while they are abroad, another option would be for a family member at home to photograph the certificate and send it to the person. The QR code stores the information and it transfers via photocopy, print or photograph. The Covid tracker app will be in place in the week of 19 July. It too could ingest a photograph of the certificate. There are ways around the problem outlined by the Deputy; it is not insurmountable.