There are several aspects that they are failing workers, firstly, most don't offer a living wage outside of London, let alone in London. Finally, the standard practice is to offer those at the bottom of the ladder a per hour wage, this can contribute negatively to both the business and the employee. The latter seems like a farfetched idea but the per hour wage is archaic and doesn't always suit the needs of the modern economy. Other retailers are doing the same but much like Sainsburys, this doesn't increase employees' wages to a real living wage. In these circumstances a per hour wage is counter-productive.
Source: CNN September 10, 2017 11:48 UTC