EPSG:10281 - RBEPP12 Grid + ODN height

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "CompoundCRS",
  "name": "RBEPP12 Grid + ODN height",
  "components": [
    {
      "type": "ProjectedCRS",
      "name": "RBEPP12 Grid",
      "base_crs": {
        "name": "RBEPP12-IRF",
        "datum": {
          "type": "GeodeticReferenceFrame",
          "name": "RBEPP12 Intermediate Reference Frame",
          "ellipsoid": {
            "name": "GRS 1980",
            "semi_major_axis": 6378137,
            "inverse_flattening": 298.257222101
          }
        },
        "coordinate_system": {
          "subtype": "ellipsoidal",
          "axis": [
            {
              "name": "Geodetic latitude",
              "abbreviation": "Lat",
              "direction": "north",
              "unit": "degree"
            },
            {
              "name": "Geodetic longitude",
              "abbreviation": "Lon",
              "direction": "east",
              "unit": "degree"
            }
          ]
        },
        "id": {
          "authority": "EPSG",
          "code": 10277
        }
      },
      "conversion": {
        "name": "RBEPP12-LCC",
        "method": {
          "name": "Lambert Conic Conformal (2SP)",
          "id": {
            "authority": "EPSG",
            "code": 9802
          }
        },
        "parameters": [
          {
            "name": "Latitude of false origin",
            "value": 50.85,
            "unit": "degree",
            "id": {
              "authority": "EPSG",
              "code": 8821
            }
          },
          {
            "name": "Longitude of false origin",
            "value": -3.25,
            "unit": "degree",
            "id": {
              "authority": "EPSG",
              "code": 8822
            }
          },
          {
            "name": "Latitude of 1st standard parallel",
            "value": 50.3,
            "unit": "degree",
            "id": {
              "authority": "EPSG",
              "code": 8823
            }
          },
          {
            "name": "Latitude of 2nd standard parallel",
            "value": 51.45,
            "unit": "degree",
            "id": {
              "authority": "EPSG",
              "code": 8824
            }
          },
          {
            "name": "Easting at false origin",
            "value": 372382.8292,
            "unit": "metre",
            "id": {
              "authority": "EPSG",
              "code": 8826
            }
          },
          {
            "name": "Northing at false origin",
            "value": 217764.7796,
            "unit": "metre",
            "id": {
              "authority": "EPSG",
              "code": 8827
            }
          }
        ]
      },
      "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
          {
            "name": "Easting",
            "abbreviation": "E",
            "direction": "east",
            "unit": "metre"
          },
          {
            "name": "Northing",
            "abbreviation": "N",
            "direction": "north",
            "unit": "metre"
          }
        ]
      }
    },
    {
      "type": "VerticalCRS",
      "name": "ODN height",
      "datum": {
        "type": "VerticalReferenceFrame",
        "name": "Ordnance Datum Newlyn"
      },
      "coordinate_system": {
        "subtype": "vertical",
        "axis": [
          {
            "name": "Gravity-related height",
            "abbreviation": "H",
            "direction": "up",
            "unit": "metre"
          }
        ]
      }
    }
  ],
  "scope": "Engineering survey and topographic mapping for railway applications.",
  "area": "United Kingdom (UK) - on or related to the rail route from Reading via Newbury to Penzance.",
  "bbox": {
    "south_latitude": 50.05,
    "west_longitude": -5.63,
    "north_latitude": 51.71,
    "east_longitude": -0.85
  },
  "id": {
    "authority": "EPSG",
    "code": 10281
  }
}

{'crs_wkt': 'COMPOUNDCRS["RBEPP12 Grid + ODN height",PROJCRS["RBEPP12 '
            'Grid",BASEGEOGCRS["RBEPP12-IRF",DATUM["RBEPP12 Intermediate '
            'Reference Frame",ELLIPSOID["GRS '
            '1980",6378137,298.257222101,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",10277]],CONVERSION["RBEPP12-LCC",METHOD["Lambert '
            'Conic Conformal (2SP)",ID["EPSG",9802]],PARAMETER["Latitude of '
            'false '
            'origin",50.85,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8821]],PARAMETER["Longitude '
            'of false '
            'origin",-3.25,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8822]],PARAMETER["Latitude '
            'of 1st standard '
            'parallel",50.3,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8823]],PARAMETER["Latitude '
            'of 2nd standard '
            'parallel",51.45,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8824]],PARAMETER["Easting '
            'at false '
            'origin",372382.8292,LENGTHUNIT["metre",1],ID["EPSG",8826]],PARAMETER["Northing '
            'at false '
            'origin",217764.7796,LENGTHUNIT["metre",1],ID["EPSG",8827]]],CS[Cartesian,2],AXIS["(E)",east,ORDER[1],LENGTHUNIT["metre",1]],AXIS["(N)",north,ORDER[2],LENGTHUNIT["metre",1]]],VERTCRS["ODN '
            'height",VDATUM["Ordnance Datum '
            'Newlyn"],CS[vertical,1],AXIS["gravity-related height '
            '(H)",up,LENGTHUNIT["metre",1]]],USAGE[SCOPE["Engineering survey '
            'and topographic mapping for railway applications."],AREA["United '
            'Kingdom (UK) - on or related to the rail route from Reading via '
            'Newbury to '
            'Penzance."],BBOX[50.05,-5.63,51.71,-0.85]],ID["EPSG",10281]]',
 'false_easting': 372382.8292,
 'false_northing': 217764.7796,
 'geographic_crs_name': 'RBEPP12-IRF',
 'geopotential_datum_name': 'Ordnance Datum Newlyn',
 'grid_mapping_name': 'lambert_conformal_conic',
 'horizontal_datum_name': 'RBEPP12 Intermediate Reference Frame',
 'inverse_flattening': 298.257222101,
 'latitude_of_projection_origin': 50.85,
 'longitude_of_central_meridian': -3.25,
 'longitude_of_prime_meridian': 0.0,
 'prime_meridian_name': 'Greenwich',
 'projected_crs_name': 'RBEPP12 Grid',
 'reference_ellipsoid_name': 'GRS 1980',
 'semi_major_axis': 6378137.0,
 'semi_minor_axis': 6356752.314140356,
 'standard_parallel': (50.3, 51.45)}