In message , Graham.
writes
On Tue, 8 Mar 2016 08:29:48 +0000, News
wrote:

Two caveats. One, I'm biased and hate combis, and Two, although we have
several showers in the house, for no particular reason, we rarely seem
to run more than one simultaneously.

You just told us why.
"Two of us shower in the morning".

But the two who shower in the morning may, or may not do so
simultaneously.
--
Graeme