England Topojson

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">

</style>	
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <script src="https://d3js.org/topojson.v1.min.js"></script>	
</head>
<body>

var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height);

var projection = d3.geoMercator()
                         .center([-1.6,52.6])
                         .scale(2000)
                         .translate([width/2,height/2]);
    var path = d3.geoPath().projection(projection);

var g = svg.append("g");
		
     d3.json("map.json", function(error, england) {
   
	g.insert("path", ".land")
	    .datum(topojson.feature(england, england.objects.Clinical_Commissioning_Groups_April_2016_Super_Generalised_Clipped_Boundaries_in_England))
	    .attr("class", "land")
	    .attr("d", path);
		
	g.append("path")
           .datum(topojson.mesh(england, england.objects.Clinical_Commissioning_Groups_April_2016_Super_Generalised_Clipped_Boundaries_in_England, function(a, b) { return a !== b; }))
           .attr("class", "mesh")
           .attr("d", path);
});

</script>
</body>

https://d3js.org/d3.v4.min.js

https://d3js.org/topojson.v1.min.js