OSGB36 National Highways B31H1 - ESRI:112080

WKT

PROJCS["OSGB36_National_Highways_B31H1", 
	GEOGCS["GCS_OSGB_1936", 
		DATUM["D_OSGB_1936", 
			SPHEROID["Airy_1830", 6377563.396, 299.3249646]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", -232920.6915322958], 
	PARAMETER["False_Northing", 110962.2178544413], 
	PARAMETER["Central_Meridian", -2.0], 
	PARAMETER["Scale_Factor", 0.9992610277292974], 
	PARAMETER["Latitude_Of_Origin", 49.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["OSGB36_National_Highways_B31H1", 
	BASEGEOGCRS["GCS_OSGB_1936", 
		DATUM["D_OSGB_1936", 
			ELLIPSOID["Airy_1830", 6377563.396, 299.3249646]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", -232920.6915322958], 
		PARAMETER["False_Northing", 110962.2178544413], 
		PARAMETER["Central_Meridian", -2.0], 
		PARAMETER["Scale_Factor", 0.9992610277292974], 
		PARAMETER["Latitude_Of_Origin", 49.0]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["Esri", "112080"]]

Data from @esri/proj-codes

{
  "wkid": 112080,
  "latestWkid": 112080,
  "gcsWkid": 4277,
  "macro": "PE_PCS_OSGB_1936_NATIONAL_HIGHWAYS_B31H1",
  "name": "OSGB36_National_Highways_B31H1",
  "wkt": "PROJCS[\"OSGB36_National_Highways_B31H1\",GEOGCS[\"GCS_OSGB_1936\",DATUM[\"D_OSGB_1936\",SPHEROID[\"Airy_1830\",6377563.396,299.3249646]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",-232920.6915322958],PARAMETER[\"False_Northing\",110962.2178544413],PARAMETER[\"Central_Meridian\",-2.0],PARAMETER[\"Scale_Factor\",0.9992610277292974],PARAMETER[\"Latitude_Of_Origin\",49.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"OSGB36_National_Highways_B31H1\",BASEGEOGCRS[\"GCS_OSGB_1936\",DATUM[\"D_OSGB_1936\",ELLIPSOID[\"Airy_1830\",6377563.396,299.3249646]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",-232920.6915322958],PARAMETER[\"False_Northing\",110962.2178544413],PARAMETER[\"Central_Meridian\",-2.0],PARAMETER[\"Scale_Factor\",0.9992610277292974],PARAMETER[\"Latitude_Of_Origin\",49.0]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"Esri\",\"112080\"]]",
  "description": "OSGB36 National Highways B31H1",
  "authority": "Esri",
  "version": "13.1.0",
  "deprecated": "no",
  "areaname": "UK - Highways England - B31",
  "extent": {
    "slat": 52.3416,
    "nlat": 52.7675,
    "llon": 1.5681,
    "rlon": 1.7357
  }
}