Japan and the UK have roughly the same vaccination percent, but the situation is vastly different. Many people think the biggest difference between Japan and the UK is that people in Japan have been wearing masks in public since 1900 or so. In the U.S., places like Atlanta enforced masks, while suburban and rural areas did not. Atlanta has far fewer cases, even though population density is higher. I think these and other facts show that masks make a big difference.
Data from 1918 also shows that masks reduce the spread of influenza.
Although I never heard about the UK being a trend setter for wearing masks (well known in Japan though), that is anecdotal... which I have no problem with.
By that measure though, Ivermectin not only passes the anecdotal test, but has some science backing it.