Spotted unexpectedly during an episode of the brilliant Endeavour was this new TV advert for Wards.

In its own way it is just as watchable as the young policeman’s moustache.

A teacher asks her very young pupils what they would like to be when they grow up.

The first wants to be a doctor and the second wants to join the police.

And the third?

Well, the look on the teacher’s face is priceless.

It’s a 30-second masterclass in getting your message across.