STEM Ambassadors
The Devon and Cornwall GNU / Linux users group has several STEM Ambassadors who are cleared to come in to either Primary or Secondary Schools to undertake STEM related Activities and support teachers / students by providing links to industry professionals.
STEM stands for Science Technology Engineering and Maths. This is part of the STEMnet network.
http://www.stemnet.org.uk/educators/primary-schools/
http://www.stemnet.org.uk/educators/secondary-schools-and-sixth-forms/