Microsoft Access database, compiled from the flat-file geotechnical datasets generated during the applied geology mapping of Wrexham, Stoke-on-Trent, Southeast Leeds and Southwest Essex. For each of these projects, data were abstracted from the available site investigations within the mapping area. The structure of the database is limited, in that all geological and geotechnical data is attributed to 'samples' at discrete depths. The dataset includes the more common geotechnical parameters, although some are entered as only class intervals, rather than in detail.