...is a new (silly) fad, and you hear about it all the time, It's essentially a sort of substitute for religion.
So I was surprised to be told that the Maryvale Institute was running a course on it. They aren't, of course. But the name Maryvale is used by all sorts of institutions around the world - retreat centres, spas, clinics - so when I googled "Maryvale mindfulness" I found places in Asia and America organising mindfulness retreats and events and whatever...and one in London that was being promoted on a website that also, separately, mentioned the Maryvale Institute in a different section.
Which just goes to show that you need to check.