A third phase of excavation by K Welsh of OA in advance of continued mineral extraction, revealed a considerable degree of truncation, previously noted across the site (SyAC 99, 232) that became increasingly marked towards the west. As a result, few archaeological features survived in the Phase 3 area other than a sparse scatter of more deeply cut pits, one of which, probably a waterhole, produced a socketed copper-alloy axe of the Sompting type, variant Cardiff II. The type dates from between c 800 and 600 BC and is found throughout much of southern England, the Midlands and South Wales.
Evaluation by T Collie of SCAU on the site of the new Spelthorne fire station revealed shallow linear ditches and a pit, all of probable Iron Age date.
Excavation by T Munnery of ASE of two of seven identified areas (SMS1 and WB6) highlighted as being of archaeological significance following evaluation (SyAC 94, 364).
Further excavation by the Roman Studies Group of SyAS led by D Bird in the field to the north-east of the Scheduled villa area revealed evidence for probably two consecutive later Iron Age enclosures on the hilltop together with eleven flat-bottomed pits to add to the three found in 2014. Quernstones and other finds confirmed the idea that these were probably for grain storage. Burnt clay, probably from wattle-and-daub oven domes and large quantities of burnt carrstone in pit fills, suggested Late Iron Age activity.
Excavation by A Haslam of PCA targeted three areas of the site, identified following earlier evaluation (SyAC 99, 218). Area 1 was situated in the south-western corner of the site. It revealed two parallel, north-west/south-east orientated ditches, interpreted as a droveway, and a series of small pits and postholes that formed a sub-rectangular enclosure, possibly an animal pen or paddock, to their east. All were of probable Late Bronze Age or Early Iron Age date. A further sub-pen was identified within the south-eastern corner of the enclosure.
Excavation by A Haslam of PCA of 1m2 test pits across a colluvial deposit that covered the site, and previously identified during a programme of evaluation (SyAC 99, 218), produced c 7000 pieces of Mesolithic, Neolithic, Bronze Age and Iron Age struck flint. The bulk of the assemblage dated from the later Bronze Age to the Iron Age and may derive from middening practices spanning those periods. Although redeposited, the flint assemblage clearly represents all stages in the reduction process, from the preparation of raw materials through to the manufacture, use and discard of tools.
Evaluation by S Reynish of COT revealed a number of ditches and a possible pit or tree-throw hollow. The larger ditches were aligned parallel to existing field boundaries, which could suggest these are former field boundaries, with the smaller ditches as internal drainage gullies or enclosures. For the most part these features remained undated, and the only find recovered – a Late Iron Age or Romano-British loomweight fragment – was considered to be residual.
Evaluation by C Douglas of ASE revealed a single ditch and an adjacent tree-throw hollow, both of which contained prehistoric pottery. A horse burial was also identified, but given the good preservation of the bone, it was probably of recent date. A number of metal-detected finds were recovered from the topsoil across the site, all of 19th century or later date.
Excavation by P Jorgensen of PCA revealed three isolated pits dated to the Bronze Age or Iron Age. It is likely that the features represent ephemeral use of the land during these periods, although they may represent peripheral activity associated with settlement beyond the boundary of the site.
Evaluation by G Webster of ASE revealed six ditches, two pits, and an irregular deposit. One of the ditches contained medieval pottery, another Late Iron Age pottery, which was considered to be residual; all the features and the irregular deposit contained slag, which suggests the presence of a medieval metalworking site in the vicinity. A subsequent strip, map and sample identified three phases of activity on the site. The earliest evidence dates from the Late Iron Age/early Roman period, with linear features representing a field system and a potential routeway.