It’s a WordPress installation based on the Generic theme by Bryan Hadaway. A plugin called Pods enables customised tailoring specifically for this site while various others provide additional functionality as needed. These plugins change too frequently to maintain accurate details of what is doing what, but you can see a list of those currently in use below:

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If you come across a feature or behaviour you’d like to emulate on your own website, and you can’t work out from the above list how it’s done, please ask me. I’ll be delighted to share. 🙂