Mars is investing £80m into its factory in the home of its confectionery business in the UK. Up to five million chocolate bars a day can now be made in Slough, Berkshire, after a major upgrade in production lines and facilities – double what the business did in 2025. Mars Wrigley UK & Ireland General Manager, Adam Grant, said: "That's enough to stretch all the way from Slough to Edinburgh." The firm said it is the single biggest investment ever made at its site and is paying for new technology - including robots - to move large boxes of chocolate around the factory floor. It is the second largest Mars factory in Europe, behind Belgium. The first ever Mars bar was created in Slough in 1932 when Forrest Mars Sr set up a small kitchen on the Slough Trading Estate. Before entering the production area, there are reminders of the history of the past 94 years with photos of memorable moments on the walls. The multi-million pound investment at the factory will pay for advanced manufacturing processes, digital innovation and workforce development. It includes major upgrades to production lines, infrastructure improvements and the introduction of new digital systems designed to improve efficiency, quality and sustainability. The firm says it will help it to deliver the "perfect" Mars bar every time. Alongside factory renovation, new training and development programmes are being introduced to upskill the workforce in automation, digital and AI-enabled roles.
BBQ - How important is investment to improve quality?
