I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Some part of the foreshore are in the Southend Airport hazardous zone area but simply agreeing to the DJI app questions and all was good.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 23/05/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.