''' Most marketing agencies in the UK are already dead. They just haven’t realised it yet.
I sold my last agency, a £10M exit, based on a model that is now fundamentally broken. We built it on smart people, structured processes, and a relentless focus on client service. Today, two of those three pillars are being systematically replaced by code. If I tried to build the same business now, I’d be laughed out of the room. The leverage has shifted, and the value has evaporated from human hours.
This isn’t a cyclical downturn or a temporary blip. We are witnessing a tectonic shift driven by agentic artificial intelligence. It’s a quiet, creeping revolution happening in server racks and APIs, and it will culminate in a great cull. By 2028, I predict that 80% of UK marketing agencies will either be defunct or forced into a desperate, low-value acquisition.
Their demise will be fuelled by three critical failures: a slavish devotion to the billable hour, a crippling addiction to expensive and fragmented SaaS tools, and a terminal inability to move from ‘using AI’ to building an agentic-first operation.
The Billable Hour is a Millstone, Not a Business Model
The dirty secret of the agency world is that the business model is rotten from the inside. It’s built on a fundamental conflict of interest: selling time. The agency wants to sell more hours; the client wants faster results. You are immediately at odds.
Let’s break down a typical £10,000 per month retainer. For a mid-sized London agency, the numbers are grim. Around 70%, or £7,000, is immediately consumed by the salaries of the account managers, the PPC execs, the copywriters. These are smart, expensive people who spend most of their day in meetings, writing emails, and tweaking campaigns—tasks that are rapidly being automated.
Another 20% (£2,000) vanishes into overheads. We’re talking office space in Shoreditch, client lunches, and, most notably, a sprawling, overlapping mess of SaaS subscriptions. More on that later. This leaves a paltry 10%, or £1,000, as pre-tax profit. A 10% margin is not a sign of a healthy, scalable business; it’s a sign of a business treading water, praying a client doesn’t fire them.
This model actively punishes efficiency. If an account manager finds a way to deliver results in half the time, does the agency halve the retainer? Of course not. They fill the spare time with busywork to justify the cost. It’s a model that rewards bloat and bureaucracy.
Now, contrast this with an AI-first model. The marginal cost of running a campaign for one client versus one hundred clients is virtually zero. The leverage is infinite. An agentic AI doesn’t need a salary, a pension, or an office Nespresso machine. It requires compute power and data. The value is no longer in the time spent but in the quality of the outcome and the underlying intelligence of the system that delivered it.
Walk into any UK agency and you’ll find a team drowning in software. There will be a £1,000/month subscription for Semrush for SEO, £1,500/month for HubSpot for CRM and marketing automation, another £500 for a social media scheduling tool, plus Slack, Asana, and a dozen other platforms for every conceivable micro-task.
I call this the ‘SaaS Tax’. It’s a silent margin killer that agencies accept as a cost of doing business. They are paying not for intelligence, but for functionality. They stitch together these disparate systems with human effort, creating complex, brittle workflows that require constant management. The irony is that they pay thousands a month for tools that their best people then have to operate manually.