Archaeological monitoring and excavation was carried out by Colchester Archaeological Trust at Birch Pit in 2013. The archaeological monitoring covered topsoil-stripping of the Stage 6 western extension (1.08ha), adjacent to the Stage 5 area excavated in 2012.<1> The significant remains included a ‘placed deposit’ (a Late Bronze Age jar without cremated bone, F4) and 17 pits and post-holes containing Late Bronze Age sherds. Other features were mostly post-medieval field ditches which are shown extant on 19th-century Ordnance Survey maps. Much of the site had been disturbed by the construction and subsequent removal of a World War II airbase.