COMPD_CS["OSGB36 / British National Grid + ODN height",
    PROJCS["OSGB36 / British National Grid",
        GEOGCS["OSGB36",
            DATUM["Ordnance_Survey_of_Great_Britain_1936",
                SPHEROID["Airy 1830",6377563.396,299.3249646,
                    AUTHORITY["EPSG","7001"]],
                AUTHORITY["EPSG","6277"]],
            PRIMEM["Greenwich",0,
                AUTHORITY["EPSG","8901"]],
            UNIT["degree",0.0174532925199433,
                AUTHORITY["EPSG","9122"]],
            AUTHORITY["EPSG","4277"]],
        PROJECTION["Transverse_Mercator"],
        PARAMETER["latitude_of_origin",49],
        PARAMETER["central_meridian",-2],
        PARAMETER["scale_factor",0.9996012717],
        PARAMETER["false_easting",400000],
        PARAMETER["false_northing",-100000],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AXIS["Easting",EAST],
        AXIS["Northing",NORTH],
        AUTHORITY["EPSG","27700"]],
    VERT_CS["ODN height",
        VERT_DATUM["Ordnance Datum Newlyn",2005,
            AUTHORITY["EPSG","5101"]],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AXIS["Gravity-related height",UP],
        AUTHORITY["EPSG","5701"]],
    AUTHORITY["EPSG","7405"]]