The Prime Minister has revealed a multi-million pound investment plan by Mars for its factory in King's Lynn.
David Cameron announced the deal as he headed to the United States for talks on the global economic outlook for 2015.
Mars employs nearly 4,000 people in the UK and more than 200 at its factory at the Hardwick Industrial Estate in King's Lynn.
An Essex firm is playing a key role in beaming pictures of Mars back to Earth.
e2V, based in Chelmsford, has developed a number of high performance imaging sensors for NASA's Mars Curiosity rover.
The vehicle has begun a two-year mission to discover more about the red planet.