Public sector organisations provide a service for everyone: for example education(schools) and security and safety (police and armed forces). These services are paid for via taxation.
Click on the below you will find some job market information to learn more about the industry:
Check out some of the below videos to to learn more about the Food and Agriculture industry and the different careers available in the sector.
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Find a Course @ 16 advertises local courses and apprenticeship that you could study to get into the Chemical industry, why not check this out: