London shopper says staff told him Sainsbury's facial recognition flagged him as a shoplifter and he was escorted out; retailer blames human error

Matt Arnold, a 46-year-old comedy promoter, was buying supplies on 6 August 2026 for a stand-up event at the neighbouring Dulwich Hamlet football club. He had scanned his items and his Nectar card at a self-service till in Sainsbury's East Dulwich store and was waiting for a staff member to approve an alcohol purchase when two managers told him he could not be served because of an incident earlier in the week. He told BBC London that a staff member said he had been identified by the AI and that the cameras had flagged him. He was asked to leave and escorted out; he told the Guardian he insisted on walking out himself. From the entrance he saw an overhead CCTV monitor alert with a red circle surrounding his face, and a colleague later paid for and collected the shopping.

Sainsbury's head office apologised the next day. A spokesperson said the incident was caused by human error and not the facial recognition technology, that the Facewatch system has a 99.98% accuracy rate and that every match is reviewed by a trained manager, and confirmed the technology had been paused at the store while an investigation takes place. A BBC image caption reports Sainsbury's claim that staff targeted the wrong person after a separate flag. Facewatch said its technology was not at fault: a correct alert was sent to the retailer and then subject to human error in the way it was handled in store. It called the suspension a precautionary measure while staff undergo additional training.

Arnold said he felt embarrassed, mortified, humiliated and powerless, described the episode as a terrifying glimpse of the future, and said staff were not being equipped to implement the AI properly. He donated the £150 goodwill voucher to a local food bank and asked why the system remained active in other stores. Silkie Carlo of Big Brother Watch called for Sainsbury's to scrap the technology.

A shopper says he was publicly refused service and escorted out of a supermarket after staff told him the store's facial recognition had flagged him; he describes humiliation, and the retailer apologised while blaming human error.

Sainsbury's apologised the next day and paused facial recognition at the East Dulwich store while an investigation takes place; Arnold donated the £150 goodwill voucher Sainsbury's gave him to a local food bank. Facewatch said suspending a store is a precautionary measure while staff undergo additional training. Sainsbury's defended the wider rollout, and Big Brother Watch called for the technology to be scrapped.