Favicon not rendering

[rmccreath]

Describe the bug
When the page is visited, the favicon is not loading. This presents as the default icon (a grey globe on Google Chrome) rather than a specific image for this site.

To Reproduce
Steps to reproduce the behaviour:

1. Go to website
2. View the icon on the browser tab/favourites list
3. This appears to be present across all devices and browsers.

Expected behaviour
A favicon with PHS branding has been included in the code, this should show on the browser tab and favourites list for this site when running in any browser.

Screenshots