A bit of digging, and it turns out there's a Coca-cola bottler in Aberdeen, the same area as Dees Bees Apiary. I'm willing to bet that purple honey coincides with grape Fanta spills or dumps

This famously happened with M&Ms

https://www.nationalgeographic.com/animals/article/121011-bl...

During the peak of the Manuka honey bubble, people were supposedly spiking competitors honey by putting out coloured sugar water here in New Zealand.

Unsure if that’s true or just a rumour.