Paternity testFull marks to Cellmark Diagnostics for the refreshing bluntness it deploys in the ads for its five-day paternity test.

At first glance, the photo of a cute small child (above) might appear to be advertising life insurance or the safety features of a car – look what you have to protect might be the subliminal message. But no, the theme is the distinctly blunter: “Is the sprog really mine?”.