Hi Kurt,

> The context is that I've got a part of my text that needs to stay
> together

Are you aware of `Displays and keeps' in groff_ms(7)

> and it is being split across columns, so I need to switch the column
> before that part starts.

Specific to groff's -ms from peering at the internals is

    .br
    .pg@bottom

> I have used a .br and .ne X, where X is guesstimate at the lines
> needed, but wondered if there was a cleaner approach.

Put the keep-together content into a diversion and then say you need the
height of that diversion.  But see Keeps above.

-- 
Cheers, Ralph.

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