Monument record LCS 123 - World War II practice trenches.

A series of pits and trenches are visible on aerial photographs from 1941 onwards as earthworks on the high ground overlooking the beach at Sizewell, centred roughly on TM47546450 (S1). They appear at roughly the same time as the anti-tank cubes LCS 122, and follow the same alignment, from roughly TM47466447 to TM47626452. They serve no obvious function, and are probably practice trenches dug at the same time that the cubes were installed. They are clearly visible on photographs of 1945, and can still be seen, although in a much degraded form, on photographs taken in 1975 (S2, S3).

2014: A survey of WW2 heritage at risk on the Suffolk coast recorded the cropmarks were still present (S4).