Supermarket sign for items out of stock

A4 Black and white Waitrose sign used on the shop floor in during the first lockdown in 2020 when there were product shortages reading ‘Sorry, we’re out of stock, We apologise that this product isn’t currently available, and are working hard to get it back on our shelves as soon as possible.’, from Waitrose & Partners, Finchley and of the type used in Waitrose shops during the first COVID-19 lockdown in 2020

At the beginning of the national lockdown, supplies of a range of products were limited. All supermarkets in the United Kingdom rely in a just-in-time model to stock their shelves. Every day deliveries are made depending on each store's individual needs. However with the impact of COVID-19, those that could afford to were buying more, sometimes stockpiling goods in case supplies ran short. The unexpected higher demand meant goods could not be transported quick enough or shelves stacked quick enough. Coupled with staff absences due to illness across the whole supply chain, stores took action on limiting purchases on essential items.