Nanny society though we are, the mature adult does not expect to be told how to eat or to breathe. Up in Dundee, however, the local NHS trust has issued an instruction book on how to do the other thing that all species do; in our case, usually once a day.

Potty training is a near-universal experience of early childhood in civilised societies. That NHS Tayside feels obliged to issue a four-page leaflet entitled Good Defecation Dynamics, complete with a diagram, suggests there may be a gaping cultural black hole in a well-populated part of eastern Scotland.

Still, let us not fall into the trap of typical Edinburgh nose-in-the-air superiority; we are always ready to learn, from the bottom up.

The advice is sound; while sitting on the throne, it counsels, don’t forget to breathe. And, in a hint rarely taught to two-year-olds, it is apparently a good idea to keep your mouth open.

No reason is given for this; perhaps it is to guard against a potentially damaging build-up of pressure that might blow off one or other end of the digestive tract. No recent cases of any such accident have been reported in Tayside, possibly because the population reaches for the prunes before matters reach such a head.

But what matters most is posture: not quite balancing a book on your head, as though you were at modelling school, but at least sitting upright. “Do not slump down but keep the normal curve in your back. Keep your mouth open as you bulge and widen,” the booklet says. “You should aim to do this every time you open your bowels.”

Have you ever, while sitting there in silent contemplation, thought about your feet? No, we thought not, but NHS Tayside has. “When you sit on the toilet make sure your feet are well supported; you may need to use a small footstool.” This cannot apply to the young, whose next stage after the potty is to sit on the real thing with little legs swinging in the air while a yellow labrador puppy steals the toilet roll.

Even though they probably don’t know the meaning of “defecation” in Dundee, preferring a more Anglo-Saxon term pronounced in the Scottish way to rhyme with “bright”, the leaflet has been distributed to clinics and GPs’ surgeries in the region. A spokeswoman for NHS Tayside turned the other cheek to accusations that the leaflet was a waste of money and would be better employed hanging on a nail behind the bathroom door.

“One in three people suffers from bowel and bladder dysfunction, and this can be extremely debilitating and distressing for individuals,” she said. “These patient information leaflets contain advice for those people who suffer from this condition, and are based on national guidance from the Association for Continence Advice.”

The cost of producing the leaflet, she added, had been minimal.

By the strange vagaries of the internet, the text of the leaflet has appeared on a website in Poland, a country of fine peasant customs that should have no need of such advice and where they would instantly dump it.

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