This casemate is of type FW3/22. During World War II, these bunkers were used for the defense of the United Kingdom against a possible enemy invasion. They were built in 1940 and into 1941.
Photos:
(1) Pillbox, East Tilbury, Essex: north bank of the River Thames.
(2) The same pillbox: looking down river (east) to WWII radar tower.
(3) Internal shot: river-facing loophole; concrete gun table/mount for light machine gun (either Lewis or Bren) or a medium machine gun (Vickers).
(4) Internal shot: inland-facing loophole, with shuttering and with similar gun table.
(5) Pillbox, East Tilbury, Essex; north bank of the River Thames
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