Change ringing is a branch of Group Theory and is mentioned in Knuth. The Steinhaus–Johnson–Trotter algorithm for efficiently generating permutations was published in the early 1960s, but has been known about by change ringers since the 1600s. Source: https://en.wikipedia.org/wiki/Steinhaus%E2%80%93Johnson%E2%8...
Edit: ...and I should add: Sayers was quite reactionary, preternaturally English, and writing in the 1930s, so I wouldn't be at all surprised if it wasn't true that change ringing was uniquely English.
https://en.m.wikipedia.org/wiki/Veronese_bell_ringing
So unless you have another reference...? (You did say "something similar" to be fair)
There are a fair few videos on YouTube as well.
It does sound slightly different as they use chords.
The reality is that someone writing in Harper's in 2025 and using a Dorothy L. Sayers Peter Wimsey story from 1934 as a supporting source is presenting a hopelessly outdated and fictional picture of the world and is going to come up for starters against the Australia and New Zealand Association of Bellringers, founded in 1962.
There's even a few change ringing towers dotted around parts of Africa, Australia, some of Europe. Just few and far between.
But when compared to England, where practically every town can be relied upon to have at least a 6 bell tower where change ringing can happen, it's no comparison.
Apparently, I now live in one of the other places where there is a tower (Carmel, IN), but I’ve never heard changes rung on it. It doesn’t appear from the website that it has any local players, which is too bad.
Hand-rung bells do still exist and get installed; offhand I know of one new installation and three old.