It's in between Southend and Canvey

Following is an extract of the Essex Record Office blog from April 2015 available here.

What is heritage? Here is Sarah-Joy Maddeaux, Project Officer for “You Are Hear” musing on what heritage is all about.
“To me, heritage is about the foundation of a shared culture that demonstrates who we are, based on a common history, geography, or society. It includes historical treasures, certainly, as evidence of our past. But I think it can encompass much more than that. We should also consider what should be captured from today’s culture, which will form part of the next generation’s heritage. This is particularly important with sound and video archives, where careful planning is necessary in order to preserve recordings that might otherwise be lost.
You Are Hear aims to digitise many of our recordings and make them available, but also to actively encourage people to develop their sense of heritage within the county of Essex: building a sense of place based on the sounds and moving images that represent the county.”

You can listen to extracts from selected recordings from the Essex Sound and Video Archive on SoundCloud:
One example for Hadleigh is available here.

This clip from a BBC Essex series of “Christmas Walks” takes you through parts of Hadleigh Country Park. It was broadcast around 1994.

Reference links:
http://www.essexrecordofficeblog.co.uk/what-is-heritage/
https://soundcloud.com/essex-record-office/3-dec