EPSG:9306 — HS2 Survey Grid + HS2-VRF height

COMPOUNDCRS[
    "HS2 Survey Grid + HS2-VRF height",
    PROJCRS[
        "HS2 Survey Grid",
        BASEGEOGCRS[
            "HS2-IRF",
            DATUM[
                "HS2 Intermediate Reference Frame",
                ELLIPSOID[
                    "GRS 1980",
                    6378137,
                    298.257222101,
                    LENGTHUNIT["metre",1,ID["EPSG",9001]],
                    ID["EPSG",7019]
                ],
                ID["EPSG",1264]
            ],
            DEFININGTRANSFORMATION[
                "HS2-IRF to ETRS89-GBR [OSNet v2009] (1)",
                ID["EPSG",9302]
            ],
            ID["EPSG",9299]
        ],
        CONVERSION[
            "HS2-TM",
            METHOD["Transverse Mercator",ID["EPSG",9807]],
            PARAMETER[
                "Latitude of natural origin",
                52.3,
                ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
                ID["EPSG",8801]
            ],
            PARAMETER[
                "Longitude of natural origin",
                -1.5,
                ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
                ID["EPSG",8802]
            ],
            PARAMETER[
                "Scale factor at natural origin",
                1,
                SCALEUNIT["unity",1,ID["EPSG",9201]],
                ID["EPSG",8805]
            ],
            PARAMETER[
                "False easting",
                198873.0046,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",8806]
            ],
            PARAMETER[
                "False northing",
                375064.3871,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",8807]
            ],
            ID["EPSG",9301]
        ],
        CS[Cartesian,2,ID["EPSG",4400]],
        AXIS["Easting (E)",east],
        AXIS["Northing (N)",north],
        LENGTHUNIT["metre",1,ID["EPSG",9001]],
        ID["EPSG",9300]
    ],
    VERTCRS[
        "HS2-VRF height",
        VDATUM["HS2 Vertical Reference Frame",ID["EPSG",1265]],
        CS[vertical,1,ID["EPSG",6499]],
        AXIS["Gravity-related height (H)",up],
        LENGTHUNIT["metre",1,ID["EPSG",9001]],
        ID["EPSG",9303]
    ],
    ID["EPSG",9306]
]

+proj=tmerc +lat_0=52.3 +lon_0=-1.5 +k=1 +x_0=198873.0046 +y_0=375064.3871 +ellps=GRS80 +units=m +vunits=m +no_defs +type=crs

proj4.defs("EPSG:9306", "+proj=tmerc +lat_0=52.3 +lon_0=-1.5 +k=1 +x_0=198873.0046 +y_0=375064.3871 +ellps=GRS80 +units=m +vunits=m +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 9306,
  "name": "HS2 Survey Grid + HS2-VRF height",
  "kind": "compound",
  "area": "UK - London to Birmingham and Crewe",
  "unit": null,
  "bbox": [
    51.45,
    -2.75,
    53.3,
    0
  ],
  "proj4": "+proj=tmerc +lat_0=52.3 +lon_0=-1.5 +k=1 +x_0=198873.0046 +y_0=375064.3871 +ellps=GRS80 +units=m +vunits=m +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (9306, 'EPSG', 9306, '+proj=tmerc +lat_0=52.3 +lon_0=-1.5 +k=1 +x_0=198873.0046 +y_0=375064.3871 +ellps=GRS80 +units=m +vunits=m +no_defs +type=crs', 'COMPD_CS["HS2 Survey Grid + HS2-VRF height",PROJCS["HS2 Survey Grid",GEOGCS["HS2-IRF",DATUM["HS2_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1264"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","9299"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",52.3],PARAMETER["central_meridian",-1.5],PARAMETER["scale_factor",1],PARAMETER["false_easting",198873.0046],PARAMETER["false_northing",375064.3871],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9300"]],VERT_CS["HS2-VRF height",VERT_DATUM["HS2 Vertical Reference Frame",2005,AUTHORITY["EPSG","1265"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","9303"]],AUTHORITY["EPSG","9306"]]');

PROJECTION
  "+proj=tmerc"
  "+lat_0=52.3"
  "+lon_0=-1.5"
  "+k=1"
  "+x_0=198873.0046"
  "+y_0=375064.3871"
  "+ellps=GRS80"
  "+units=m"
  "+vunits=m"
  "+no_defs"
  "+type=crs"
END

9306=COMPD_CS["HS2 Survey Grid + HS2-VRF height",PROJCS["HS2 Survey Grid",GEOGCS["HS2-IRF",DATUM["HS2_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1264"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","9299"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",52.3],PARAMETER["central_meridian",-1.5],PARAMETER["scale_factor",1],PARAMETER["false_easting",198873.0046],PARAMETER["false_northing",375064.3871],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9300"]],VERT_CS["HS2-VRF height",VERT_DATUM["HS2 Vertical Reference Frame",2005,AUTHORITY["EPSG","1265"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","9303"]],AUTHORITY["EPSG","9306"]]