D3 Examples - D3 + Leaflet - Map overlaid with scaled point data (Data: Empty properties in Cardiff postcodes)

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Postcodes</title>
        <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.css" />
        <link rel="stylesheet" href="style.css">
        <meta name="viewport" content="width=device-width, initial-scale=1">
    </head>
    <body>
        <div id="map"></div>
        <script src="//cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.js"></script>
        <script src="//cdnjs.cloudflare.com/ajax/libs/d3/4.7.3/d3.min.js"></script>
        <script src="script.js"></script>
</body>
</html>
​
    