The app is appalling. I am technologically very literate but having to juggle a basket of shopping, a bag for packing, a Waitrose card, a smartphone and a means of payment is too much. Why do the vouchers not download to the Waitrose card once selected? If, as today, not a single item with a voucher was in stock, how do I know what is in the same category and can be substituted? Why do barcodes need to be scanned by the payment machine, not the main screen? The staff are endlessly patient but had a queue of customers needing help or explanation. This is not just a matter of tweaking; the whole thing needs rethinking.