Mars invests US$255M to transform UK Slough factory into AI-driven manufacturing hub

UK – Mars, Incorporated has announced a £190 million ($255 million) investment programme to modernize its historic Slough factory in Berkshire, England, transforming the facility into a next-generation manufacturing hub powered by robotics, artificial intelligence and advanced engineering technologies. 

The investment, covering the period between 2023 and 2028, follows the company’s earlier announcement in September 2025 to invest €1 billion across the European Union. Of the total investment allocated to the Slough facility, £32 million is planned for 2027 and 2028. 

The latest commitment also builds on more than £118 million invested across Mars’ UK Snacking, Food and Petcare businesses during 2024 and 2025, underlining the strategic importance of the UK to the company’s long-term growth plans. 

Established in 1932 by Forrest Mars, the Slough factory is recognised as the birthplace of the iconic MARS® bar and currently manufactures several flagship confectionery brands including GALAXY, MALTESERS and the MARS bar. In addition to supplying the UK market, the site exports products to Ireland and the Netherlands. 

Mars said the investment will introduce advanced manufacturing technologies, combining upgraded machinery with robotics, AI systems, advanced cooling technologies and energy-efficient utilities to improve operational performance and sustainability. 

Adam Grant, General Manager of Mars Snacking UKI, said: “This investment reflects our confidence in the UK as a hub to manufacture and innovate. In taking a long-term view, we are ensuring our operations remain world-class, competitive and fit for the future.” 

Grant added: “Our Slough factory is deeply rooted in our heritage, and as a proud family-owned business, we are committed to investing in a future that creates lasting, positive impact for the communities in which we operate.” 

A major component of the modernization programme includes the deployment of digital twin technology, which will use AI-driven data analysis to optimise production processes and improve consistency across product lines.  

Mars said the technology would support real-time decision-making on the factory floor while reducing waste and improving efficiency. 

The company also said the investment would support workforce development through extensive upskilling programmes focused on advanced engineering, automation, data management and AI-enabled manufacturing roles. 

UK Business and Trade Secretary Peter Kyle welcomed the investment, saying: “This £190 million investment by Mars is a strong vote of confidence in the UK as a place to manufacture and innovate.” 

Earlier this month, Mars also announced plans to invest AUD$200 million in its Australian manufacturing operations by the end of 2027 to expand production capacity, drive innovation and strengthen renewable energy initiatives. 

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