GEOGCS["Unknown datum based upon the Airy 1830 ellipsoid",
    DATUM["Not_specified_based_on_Airy_1830_ellipsoid",
        SPHEROID["Airy 1830",6377563.396,299.3249646,
            AUTHORITY["EPSG","7001"]],
        AUTHORITY["EPSG","6001"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.01745329251994328,
        AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4001"]]