Shanghai - Costa Coffee has appointed iris Worldwide as its main creative agency in China as it looks to target the growing population of Chinese coffee drinkers. The agency is tasked to support the coffee chain in energising the brand in China and keep the brand relevant in the competitive coffee market. Costa Coffee has been in the Chinese market since 2007 and the appointment marks the brand's first engagement with a creative agency, according to iris. "The start of our working relationship with Costa Coffee sees the continued expansion and diversification of the iris portfolio in the Chinese market," said Luke Nathans, regional development director of APAC, iris Worldwide.