It does sometimes says that in Adblock but everything usually still works. Mine says that at the moment but all the stations are fine. Try another Adblocker if it isn't?

You can fix without a VPN in the UK. Use Chrome, grab a free adblocker extension - AdBlock free version works. It must allow you to add a custom url. For AdBlock go to Options/Filter lists/Custom filter lists and add this URL "https://radio.garden/api/geo" (without quotations)