Some 600,000 consumers buy groceries online, but many often find the experience frustrating, suggests new research in the UK The UK supermarkets have worked hard to make their website shopping services easier to navigate, but customers often find they cannot buy even the most basic items such as bread or baked beans because they are out of stock. Inconvenient or unreliable delivery times are also hampering the enjoyment of consumers shopping online, suggests a survey carried out by retail weekly The Grocer.