CWS13 Grid - EPSG:10199

WKT

PROJCS["CWS13_Grid", 
	GEOGCS["CWS13-IRF", 
		DATUM["CWS13_Intermediate_Reference_Frame", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 199668.0926], 
	PARAMETER["False_Northing", 89354.3229], 
	PARAMETER["Central_Meridian", -2.9], 
	PARAMETER["Scale_Factor", 1.0], 
	PARAMETER["Latitude_Of_Origin", 52.4], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["CWS13_Grid", 
	BASEGEOGCRS["CWS13-IRF", 
		DATUM["CWS13_Intermediate_Reference_Frame", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		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", 199668.0926], 
		PARAMETER["False_Northing", 89354.3229], 
		PARAMETER["Central_Meridian", -2.9], 
		PARAMETER["Scale_Factor", 1.0], 
		PARAMETER["Latitude_Of_Origin", 52.4]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "10199"]]

Data from @esri/proj-codes

{
  "wkid": 10199,
  "latestWkid": 10199,
  "gcsWkid": 10196,
  "macro": "PE_PCS_CWS13_GRID",
  "name": "CWS13_Grid",
  "wkt": "PROJCS[\"CWS13_Grid\",GEOGCS[\"CWS13-IRF\",DATUM[\"CWS13_Intermediate_Reference_Frame\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",199668.0926],PARAMETER[\"False_Northing\",89354.3229],PARAMETER[\"Central_Meridian\",-2.9],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",52.4],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"CWS13_Grid\",BASEGEOGCRS[\"CWS13-IRF\",DATUM[\"CWS13_Intermediate_Reference_Frame\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],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\",199668.0926],PARAMETER[\"False_Northing\",89354.3229],PARAMETER[\"Central_Meridian\",-2.9],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",52.4]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"10199\"]]",
  "description": "CWS13 Grid",
  "authority": "EPSG",
  "version": "10.079(13.2.0)",
  "deprecated": "no",
  "areaname": "UK - Chester to Shrewsbury",
  "extent": {
    "slat": 52.5,
    "nlat": 53.26,
    "llon": -3.16,
    "rlon": -2.65
  }
}