Diabetes is a massive problem for the UK. It's not far off being the country's biggest killer disease. The first campaign (national ooh) highlights the fact that people are unaware just how deadly diabetes can be. The second campaign characterises diabetes as a threat to the whole country, which will only be defeated by everyone working together to fight it.
Fairly Interesting Note - Spencer Rowell, the photographer for the silent assassin, was the photographer for the iconic man and baby Athena poster.