[FergusArgyll]

There was a great radiolab episode about it a few years ago but I remember it being in Utah not UK

[shagie]

https://radiolab.org/podcast/man-against-horse

https://en.wikipedia.org/wiki/Man_versus_Horse_Marathon

> ... There are other Man versus Horse races — in Scotland based at Dores, near Loch Ness, in Central North Island, New Zealand and in the U.S. city of Prescott, Arizona.

And the Arizona race page: https://managainsthorse.com