Unless you’re in the glossy, perfectly inclusive world of marketing, advertising and PR, you’ve probably never even heard of the big thing.

We’re talking about a very big British thing that employs over 100,000 people around the world, many of them in London. Even the people who work in the thing don’t always know they are inside the thing, because what they see is a different thing.

This big British thing used to be the very biggest thing in the world of its type, until it was recently overtaken by an even bigger French thing, which itself is about to be overtaken by two other gigantic American things that are merging to become the biggest thing ever.

Some of you have already worked out we’re talking about the advertising holding companies. IFYKYK. In a global industry worth a trill

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