10-14-2019 09:26 AM
This sounds like a question for Polar Pro since they are the ones making the filters. A quick search doesn't turn up anything for the UK, they'll probably concentrate on filling supply and demand for their larger markets first before branching out into other area's. I would contact Polar Pro directly and ask them.
10-18-2019 04:34 PM
"PolarPro ND Filter 3-Pack for GoPro Hero8 Black (Shutter Collection ND8/16/32)" is available on Amazon for £59.99 with free delivery at:
If you're an Amazon Prime member then you can get them tomorrow!