Detailed magnetometry survey was carried out across two sites at either end of the A3 Hindhead road improvement scheme in Surrey. The survey formed a trial of magnetic survey across geology and soils that are known to often produce poor results. Within Site 1, at the northern end of the scheme, linear anomalies caused by former ploughing suggest a sufficient contrast between topsoil and subsoil magnetic susceptibilities exists for useful magnetic survey. Site 2, at the southern end of the scheme, revealed positive linear anomalies that may relate to former cut features and again suggest a useful contrast in soil magnetic susceptibility.