PROJCS["OSGB36 / Heathrow Airport GIS Grid 2026",
    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["Local Orthographic"],
    PARAMETER["latitude_of_center",51.4701102238889],
    PARAMETER["longitude_of_center",-0.451656585555556],
    PARAMETER["azimuth",359.700932272222],
    PARAMETER["scale_factor",1.000002816],
    PARAMETER["false_easting",7334.818],
    PARAMETER["false_northing",5637.421],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","11390"]]