PROJCS["OSGB36 / Heathrow Airport GIS Grid 2026",GEOGCS["OSGB36",DATUM["Ordnance_Survey_of_Great_Britain_1936",SPHEROID["Airy 1830",6377563.396,299.3249646],EXTENSION["PROJ4_GRIDS","OSTN02_NTv2.gsb"]],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"]]