Add link to blog post

constituencies.html

@@ -33,7 +33,7 @@ <h1>Hex map of UK constituencies</h1>
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-			<p>We've created a (pointy-topped) hex map of UK parliamentary constituencies. We had to make some compromises. If you disagree, move the hexes around until you are happy (click on a hex you want to move then click on an empty hex). Make sure to save the resulting <a href="hexjson.html">HexJSON file</a> so you have your version for the future. You can also save the map as a scalable vector graphic (SVG).</p>
+			<p><a href="https://odileeds.org/blog/2017-05-08-mapping-election-with-hexes">We've created a (pointy-topped) hex map</a> of UK parliamentary constituencies. We had to make some compromises. If you disagree, move the hexes around until you are happy (click on a hex you want to move then click on an empty hex). Make sure to save the resulting <a href="hexjson.html">HexJSON file</a> so you have your version for the future. You can also save the map as a scalable vector graphic (SVG).</p>
 			<p style="text-align:center;">Colour by: 
 			<button id="colour-pop" class="switchdata b5-bg">population</button>
 			<button id="colour-reg" class="switchdata c10-bg">region</button>