I've used Ocado for years. I've also tried deliveries from the other main supermarkets. While the others have consistently disappointed, Ocado has consistently delivered. A few of my favourite points: 1 hour delivery slots Change your order up to the night before + a text to remind you Delivery on time every time - sometimes early, but drivers call to check it's convenient Friendly drivers Easy to shop using favourite items, special offers You can't accidentally order out of stock items Items RARELY missing or substituted in order + text to let you know No random/weird substitutions Drivers collect used carrier bags Bags colour coded for fridge, freezer, cupboard, substitutions Delivery note listed in order of "use by date" Returns, refunds and errors simple to process online or by phone