Edit tiger code practices

<p><span style="color: #ecf0f1;">Details and advice on the colour coding system is readily available as part of the ‘Follow the Colour Code’ campaign, which you’ll find at <a style="color: #ecf0f1;" title="Follow the Clinical Waste Colour Code" href="http://www.followthecolourcode.co.uk" target="_blank" rel="noopener">www.followthecolourcode.co.uk</a> or by using <em>#followthecolourcode</em> on twitter.</span></p>

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