STUDENTS celebrated a college technology day by making solar stills to produce clean drinking water for the Developing World.

The stills, which are powered by the heat of the sun, can turn polluted or sea-water into clean drinking water for emergency use.

About 300 students at Northallerton College, working in teams of a dozen, spent the day not only designing, making and testing the stills but also devising a marketing strategy to sell them as flat packs to specific parts of the world.

Steve Marshall, head of design and technology, who led the team organising the project, said: "We wanted to challenge the students with a real and relevant problem." The technology day was part of an eight-week programme designed to welcome 300 students who moved over to the college from its partner school, the Allertonshire, two months early.