The other thing to consider is supermarket sales volume is higher than normal (due to less food being consumed in hospitality, less foreign travel etc, more eating at home etc). While this is good on the surface for supermarket it does create major problems int he supply chain. Depots have a limited capacity, although you can employ more pickers you need to manual handling equipment (reach trucks, low level order pickers etc) which is not always readily available, then add in that there is only a fixed number of loading bays at each depot, then you need more vehicles - you can hire more (but they are in short supply) and even if you can do this you still need people to drive them......