''' Most marketing agency founders are lying to you. They’re probably lying to themselves, too.
I say this as someone who built and sold a marketing agency for £10M. The entire business model, the very foundation upon which retainers and project fees are built, is a carefully constructed fiction designed to obscure a simple truth: the relationship between what clients pay and the results they get is fundamentally broken.
That broken model is about to be shattered. Not by a recession, not by a new social media platform, but by a technological shift so fundamental that the term ‘agency’ will feel archaic by 2028. Agentic AI is an extinction-level event for the marketing services industry as we know it.
My forecast, based on the data we’re seeing and the agentic products we’re building, is that 80% of UK marketing agencies will either be acquired for their Rolodex or simply cease to exist within the next four years.
The lie is the billable hour. It’s the retainer. It’s the entire concept of trading time for money in a creative and strategic endeavour. When I was running my last agency, the tension was constant. Clients wanted faster, better results for less money. My team, incentivised by utilisation rates and project hours, was implicitly rewarded for taking longer.
Every dashboard, every weekly report, every quarterly business review was a performance, a piece of theatre to justify the ongoing fee. We were selling reassurance as much as we were selling results. We celebrated the inputs—the campaigns launched, the content written, the ads managed—because the outputs were often unpredictable and terrifyingly non-linear.
Selling the agency was a lucrative exit, but it also crystalised this realisation for me. The buyer wasn’t acquiring a finely tuned results machine. They were acquiring a book of revenue, a team, and a brand. The core intellectual property wasn’t a methodology for guaranteed growth; it was a process for managing client relationships and extracting a monthly fee. This is the uncomfortable truth for almost every agency in the UK.
The model is predicated on inefficiency. Human-led research, copywriting, ad management, and data analysis are slow, expensive, and variable in quality. An agency’s profit margin is directly tied to how effectively it can arbitrage the cost of its talent against the fees it can command. The incentive is to maintain a certain level of managed inefficiency. That is a fatal business model in the age of AI.
Generative AI is a Toy. Agentic AI is a Weapon.
Right now, most marketers are patting themselves on the back for using ChatGPT to write a blog post or Midjourney to create some ad creative. They are fatally misunderstanding the technology. This is the equivalent of seeing the first Ford Model T and thinking its primary use will be as a stationary power source for a water pump.
Generative AI is a tool. It requires a human operator to prompt it, edit it, and connect it to other tools. It’s a productivity enhancer, but it doesn’t change the fundamental input-output equation. It makes the inefficient human marginally faster.
Agentic AI is different. An AI agent is an autonomous system that can understand a goal, create a plan, execute tasks, and adapt based on the results. It doesn’t just write one email; it runs the entire email marketing campaign. It defines the audience segments, writes the copy for ten variants, sets up the A/B test, deploys the campaign via the ESP, analyses the open and click-through rates, and then rewrites the underperforming variants for the next send, all while the human strategist is asleep.