Wessex Archaeology (WA) was commissioned by Mackley Construction to undertake a program of palaeoenvironmental assessment in support of the Lydd Ranges Sea Defence Scheme. A staged program of assessment and scientific dating was agreed, involving XRF core scanning, pollen and microfaunal assessment, followed by Optically Stimulated Luminescence (OSL) and radiocarbon dating of suitable deposits. XRF core scanning focused on the fine-grained above-gravel stratigraphy (defined as those deposits forming following emplacement of the gravel barrier) from across Zones C, E and G, including three rotary cores (C01/WA-S03, E01/WA-S02 and G01/WA-S01), deposits from the marsh preserved behind the current Green Wall (HHWS-107) and a monolith recovered from clay exposures on the foreshore (monolith 111, TP11). The results of core scanning were used to identify potential zones of sediment mixing to refine the scope of the OSL dating. Targeted assessment of diatoms, foraminifera and ostracods was undertaken on HHWS-107 and TP11, with pollen assessment of peat from HHWS-107. The program of works is designed to address a series of principal objectives, including dating of sediment infilling tidal inlets in the barrier system and investigation land-ocean interactions. This report assesses the preservation and quality of data to meet those research aims. OSL dates from borehole C01/WA-S03 extended from the Bronze Age to the post-medieval, while those from GO1/WA-S01 extended from the Iron Age to the Romano-British period. The OSL dates were in poor agreement with radiocarbon dates from closely associated peat deposits which dated to the Romano-British/early medieval period. The dates reflect the very low concentrations of datable fine sandy quartz grains present in the samples. Partial resetting of grains is also likely to have resulted in over-estimation of the dates, resulting in older ages that would otherwise be expected. Preservation of microfauna was uniformly poor in the samples, although one sample from clay exposures on the foreshore (monolith 111, TP 11) was suggestive of a marine-brackish environment. Pollen preservation and concentration from the peat in HHWS-107 was variable, though generally poor. There is some suggestion of mixed oak-hazel woodland in the early Romano-British period and a subsequent reduction in woodland and expansion in tall herb swamp. Local vegetation may be filtering out pollen from the extra-local environment, but in general surviving ...