wiki is editable by absolutely anyone, and that page is a very small percentage of the chip manufacturers
Here:
http://www.companiesintheuk.co.uk/ltd/cambridge-microprocessor-systems
btw... Intel manufactures in Essex as well
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&ved=0CDAQFjAB&url=http%3A%2F%2Fwww.indeed.co.uk%2FIntel-Engineer-jobs-in-Mile-End-CO4&ei=KyfkUsvDAsHuoATUi4GwBA&usg=AFQjCNGZKi_q6PqKNosZPe8N7-SQQkcGyw&sig2=tZQyVv0E27qSmFgggXr0Jg&bvm=bv.59930103,d.cGU
and Essex has a literal microchip colledge.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&ved=0CC8QFjAB&url=http%3A%2F%2Fwww.essex.ac.uk%2Fcsee%2F&ei=aSfkUvoEiIaiBKX1gZAL&usg=AFQjCNF5tHMg62_z9AASq25tBf6sCsOj4Q&sig2=1fCxqDsR3WDudTu3f6D8jQ&bvm=bv.59930103,d.cGU