KEY POINTS

The relationship between brands and their media suppliers has been in the spotlight since the start of the year when one of the world's largest advertisers attacked agencies for being untrustworthy.

Marc Pritchard, the chief marketing officer at Procter and Gamble, said the media supply chain was "murky at best and fraudulent at worst," in a speech given at a digital marketing conference, although he added that P&G was partly to blame for not scrutinizing agency contracts closely enough.