Agency and client relationships: Gill Huber on pitching, AI and staying in it for the long run

Gill Huber, Managing Director at Ingenuity+
Key points This session kicked off a four-week collaboration between TMM and WACL, the 103-year-old network of over 350 senior women in advertising, marketing, tech and communications. Gill has spent her career at the intersection of brands, agencies and the wider marketing community, and speaks to hundreds of agencies a year about what actually makes […]


Key points

  • Agency spend is set to pass £50 billion in the UK for the first time in 2026, but the pressure on both sides is real: 70% of senior marketers say their personal accountability has grown in the last two years
  • Fractional CMOs aren’t a substitute for a strategic agency, they bring something different, not less
  • AI is now a hygiene factor in pitching, not a differentiator. Brands want transparency about how it’s used, not a bolt-on slide
  • The most common reason clients leave isn’t a big failure, it’s operational discipline: missed deadlines, work that isn’t right first time
  • Brands and agencies define “a pitch” completely differently, which causes a lot of wasted effort. Ask the practical questions before committing
  • For smaller agencies and consultants: the pitch starts long before the pitch starts. Visibility and reputation do more than any pitch deck
  • Shared clarity on the brand’s actual business goals matters more than any single metric, ask what’s behind the ask
  • No single right model for retainers vs. project work, what matters is both sides being honest about which one it is

Table of Contents


This session kicked off a four-week collaboration between TMM and WACL, the 103-year-old network of over 350 senior women in advertising, marketing, tech and communications. Gill has spent her career at the intersection of brands, agencies and the wider marketing community, and speaks to hundreds of agencies a year about what actually makes client relationships work. This is what she covered.

The state of agency-client relationships right now

Ingenuity Plus runs a quarterly pulse survey of over 250 UK marketing directors and CMOs, running for six quarters now, deliberately spread across regions and budget sizes rather than focused on the biggest spenders. Marketing spend through agencies is set to pass £50 billion for the first time in 2026, and there are more than 25,000 agencies operating in the UK.

But growth doesn’t mean an easy time of it. Gill described herself as “a cynical optimist”: agencies are under real pressure, consolidation has bitten, and marketers are being asked to do more with fewer people. Seventy per cent of senior marketers told the survey their personal accountability for proving marketing’s value has grown in the last two years, not just the business’s accountability. It’s a lonelier job than it looks from outside, especially where the CMO isn’t part of the leadership team.

Fractional CMOs aren’t a swap for a strategic agency

Asked whether fractional CMOs are eating into what agencies used to offer, Gill pushed back on the comparison. Agencies bring an outside-in view, plus a breadth of category experience that a single fractional hire won’t replicate. A fractional CMO brings something real, often strategic input and a fresh perspective, but it’s a different kind of value, not a substitute. Her tip for agencies: get to know the fractional CMOs in your world directly. They’re often genuinely useful people to have in your corner.

AI is a hygiene factor now, not a nice-to-have

Brands expect agencies to be using AI, and Ingenuity Plus’s data puts around 15% of total marketing spend against AI initiatives already. The pressure is heaviest in performance-driven work: targeting, optimisation, predictive analytics. What’s changed isn’t the ambition, it’s the timeframe. Two or three years ago AI was a future conversation. Now it’s near-term and increasingly a factor in how agencies get chosen at all.

What brands want isn’t a slide on AI bolted onto a pitch deck. It’s transparency about how an agency is actually using it, and evidence of what that’s changing for the better.

“It’s not one size fits all. They want to know, and they want to understand, they want to see it.”

Execution is getting cheaper. The thinking isn’t.

One question put to Gill: if AI has made it possible for almost anyone to knock together something that used to need a specialist, what are clients still willing to pay agencies for? Her answer came back to the same idea from a different angle. Tools that let you generate things quickly are genuinely useful, but the value was never really in the output alone. It’s in the thinking behind it.

“If everyone could do it, you’d end up with a sea of sameness. So agencies still bring that challenge in thinking, that strategic thinking, that outside-in thinking.”

Why clients actually leave agencies

Ingenuity Plus asks brands this directly in every pulse survey, and the top answer isn’t usually about big strategic failures. It’s operational discipline: missed deadlines, work that isn’t right first time, and what Gill called “emotionally draining but the work is good enough”. Small, repeated friction wears a relationship down faster than one bad campaign does.

TMM’s own experience backs this up in a smaller way. Keeping a Slack channel open with clients, and dropping in small wins regularly rather than saving everything for a big update, has done more for the relationships that matter than any single grand gesture. As Gill put it, long partnerships like McDonald’s and its agency of many years work because of “really good operational discipline, really good respect for each other.”

Getting past a pitch process that goes nowhere

There’s a genuine mismatch here. When Ingenuity Plus asked brands and agencies separately to define what a “pitch” even means, brands were split fairly evenly across four different definitions, from a full multi-stage pitch down to a short chemistry meeting. Agencies, by contrast, overwhelmingly default to assuming it means the full process. That gap causes a lot of wasted effort on both sides.

Gill’s advice: ask the practical questions upfront, before committing. How many stages, what’s the timeline, who’s involved, what’s the budget. And it’s fine to say no. Agencies that turn down pitches that aren’t right for them tend to win the ones they do go for, and they don’t neglect the clients they already have while chasing new ones.

How smaller agencies and consultants get noticed

For the soloentrepreneurs and smaller agencies in the room asking how to get on a client’s radar at all, Gill’s answer was blunt: the pitch starts long before the pitch starts. By the time a brief lands in a trade title, that opportunity has often already gone to whoever did the groundwork. Being visible in the right places, writing about your category, and building a reputation before there’s a live brief all matter more than anything you can do once a process has begun.

Her phrase for it: “easy to buy, hard to leave.” And existing clients are still your best source of new ones. If they’re happy to talk about you to their own network, that carries more weight than any pitch deck will.

The question behind the question

Perhaps the most useful idea in the whole session was this: shared clarity on the brand’s actual business goals matters more than anything else in an agency relationship, because different disciplines will always measure success differently. Media, creative and PR will each define a win their own way. What keeps everyone pointed the same direction is agreeing, early and explicitly, what the brand’s leadership team actually needs to see.

“It’s talking the language of the CFO, talking the language of the boardroom. What are the demonstrations that actually show that leadership team that marketing is working?”

Gill’s advice for anyone in that position: don’t just answer the metric you’ve been asked for. Ask what’s behind the ask. Sometimes the number a client requests isn’t the one that will actually prove the point they need proving.

On long-term retainers versus project work

There’s no single right model, in Gill’s view. Some disciplines genuinely need a long-term commitment to earn the investment they require. Project work is fine too, provided both sides are honest about whether it’s meant to lead somewhere or stay a one-off. The relationships that go on for fifteen or twenty years work because both sides keep growing and keep delivering, not because of the length of the contract itself.