Looking East towards Monkey Beach from Buzz'n.
There is often speculation about the concrete blocks that are by the beach at its western end, near Buzz'n Fleet. They are thought to be an anti-landing craft defence. The concrete blocks had lengths of old tram line from Colchester concreted in, at an angle, and with a point just below the high water mark. [1]
The Lions Talking Magazine No.2 from 1979 talks about the blocks just appearing in the mud --- they had been covered for several years. It speculates on their use but comes to no conclusion.

The blocks are in Essex Record Office Sites and Monuments Record SMR / EHER 21111 which records them as WW2 anti-invasion obstacles.
An Article in The Courier 18 June 2023 said the blocks have now been removed (on safety grounds).

Extreme left, on the beach, are the remains of a pill box.