Danny Alexander recounted in the Diary last week his daughter’s efforts in making unicorn poop. This is something of a historic marker. Most members of the cabinet in previous generations have been unforthcoming on faecal matters, particularly when it comes to comestibles.

In other countries there is less reticence. In Catalonia, Christmas isn’t Christmas without the Caga Tió, a log that is encouraged to defecate sweetmeats by being hit with a stick during the singing of a traditional song.