A leading UK supermarket chain is trialling a store with no tills, so customers are expected to pay for items with their app. Customers struggling with the system can still pay by cash or card at a helpdesk.

Sainsbury's Local in Holborn, London is running the pilot for three months. Other stores have offered self-checkout by app before, but this is the first time in the UK that you can only checkout in a shop this way.

Emma Simpson reports.

Filmed and edited by Dougal Shaw