However, the company was recently faced with more than the average piece of graffiti, when a huge Banksy-style artwork was painted on scaffolding outside the agency's entrance.
The piece, which was created by the graffiti artist D*Face, appeared on the side of some scaffolding erected by builders working on W&K's roof extensions.
It featured a collage of brand logos including McDonald's, Burger King, Coca-Cola and, more importantly, Nike, fashioned into a large peace sign above the line: "What wars are for."
Diary wonders how W&K's biggest client might feel if it turned up to see its world-famous swoosh included in a huge anti-capitalist statement on the side of its agency. Needless to say, W&K's painters quickly got to work getting rid of it.