Please use this page to report any incidents of speeding that you witness : 

https://www.essex.police.uk/area/your-area/local-policing-team-contact/contact-your-local-policing-team/id-like-to-tell-you-about-something-im-concerned-about-in-my-neighbourhood/tell-us-about-something-youve-concerned-about-in-your-neighbourhood/?lid=c3858391-1ff2-48f4-942b-9149faed13d6