Two phases of archaeological excavations were undertaken within the Tilly's Lane development area on the north side of Staines High Street. A single trench was excavated at Tilly's Lane East between April and June 1999, with two trenches at Tilly's Lane West - British Gas and High Street sites - between February and May 2000. All the trenches lay on the gravel island, though Tilly's Lane East and the British Gas site lay within early flood zones.

An evaluation and small-scale excavation of a site at Egham High Street located a pit and a gully of prehistoric date, several features of medieval date including a cobbled yard surface and midden, and structural remains dating to the late medieval/post-medieval transition period.

In January 2013, Oxford Archaeology carried out a trial trench evaluation at Land at Blackburn Trading Estate, Northumberland Road, Stanwell, Surrey. Features associated with the early 20th century development of the site for an animal feeds factory were recorded. No earlier archaeological features were present. Across much of the site, recent remediation work is likely to have removed any archaeological features which may have once existed.

Evaluation by P Stephenson of ASE revealed evidence for late post-medieval activity in the form of landscape or garden features within the grounds of Sunbury Manor.

Evaluation by N Wells of FA revealed no finds or features of archaeological significance

Watching brief by L McCaig of WA recorded no archaeological finds or features although the natural geology was not reached owing to the depth of modern disturbance and the limited extent of the impact of the development.

Evaluation by P Kehoe of AOC within a car park north of the studios produced no finds or features of archaeological significance.

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 O Rouard of ASE revealed no finds or features of archaeological significance.

Evaluation by D Hopkinson of ASE revealed a generally undisturbed stratigraphy overlying the natural Kempton Park Gravel but no finds or features of archaeological significance.