How to choose a marketing agency in the UK: the honest seven step guide

By Doug Dinwiddie, Founder, Maitland

Published 2026-07-29

Choosing a marketing agency in the UK? The seven step guide: costs, one team or several, the questions to ask, red flags, and how to judge the first 90 days.

Executive summary

Seven steps to choosing a UK marketing agency without regretting it: decide if you need one at all, set the goal and budget, learn market prices before you shop, choose between one team and several specialists, shortlist on evidence, ask every agency the same five questions, then judge the first 90 days on tracking, baselines and readable reporting.

How do you choose a marketing agency you will not regret in six months? And how are you supposed to tell them apart when every single one claims proven results, passionate people and a tailored approach?

You are in the right place. We are an agency, so we have an interest, but we publish our prices and we would rather lose you honestly than win you with vagueness, so we have written the guide we wish every prospect had read before they met anyone. Including us.

Here is the shape of it: seven steps that take you from "do we even need an agency?" through to judging your choice in the first 90 days, with the honest numbers at every stage, the questions that expose a weak agency, the red flags that should end a conversation, and links to the deeper guides we have written on each decision along the way.

Step one: decide whether you need an agency at all

Do not start with a shortlist. Start with the honest question most agencies will never put to you: is an agency the right answer here?

Sometimes it is not. If your annual marketing spend is comfortably past £120,000 to £150,000 and marketing is a core daily function, building an in-house team can be the better value. If you have a genuine one-off project, you need a specialist for the project, not a partnership. And if you have a strong in-house marketing lead already, the hybrid model, your person conducting with specialists executing, is often the sweet spot. We have written an honest comparison of agency versus in-house , including the loaded costs of hiring that never make it into the plan.

If you are below that threshold, growing, and without a full team in place, an agency is usually the right vehicle. Carry on.

Step two: define the job and the number

An agency cannot hit a target you never set. Before you speak to anyone, write three things down.

The revenue you want in 12 months. The gap between that and today. And the budget you can commit to closing it, worked out honestly. If you have not set that budget yet, our guide to what percentage of revenue to spend on marketing gives you the UK bandings and a goal-backwards method that takes half an hour.

This step does two jobs at once. It gives every agency you meet the same brief, which makes their answers comparable. And it flushes out the vague ones immediately, because an agency that cannot engage with a specific number in a brief will not engage with one in a contract either.

Step three: know the market prices before you shop

Walking into agency conversations without knowing the going rate is how businesses end up either overpaying or buying something too cheap to work.

The short version: UK retainers run from roughly £1,250 to £3,500 per month for a single channel, and £3,500 to £16,750 per month for multi-channel work, with London typically 15 to 25 per cent higher for the same output. Below £1,000 per month you are usually buying task execution rather than strategy, which is the most expensive kind of cheap. The full breakdown, including exactly what we charge, is in our guide to what a marketing agency actually costs in the UK .

One test worth applying at this stage: does the agency publish its prices, or at least give you a straight range before a sales call? An agency confident in its value has no reason to hide the number. The runaround protects the agency, not you.

Step four: one team, or several specialists?

Decide the shape of the help before you choose the supplier, because the two mistakes here are opposites.

The first mistake is collecting specialists one sensible decision at a time until you have four suppliers, four dashboards, no one owning revenue, and you personally doing the joining up. We see the wreckage of that model weekly, and we have written up why juggling multiple agencies fails , along with the honest cases where separate specialists genuinely work.

The second mistake is buying "integrated" as a label rather than a fact. Plenty of agencies sell every service and deliver them in internal silos, which recreates the multi-agency problem under one invoice. The test is simple: ask how the SEO work informs the paid work, how the ad data feeds the content plan, and who owns the single revenue number. Specific answers mean a team. Vague ones mean a collection with shared letterhead.

Step five: build the shortlist on evidence, not adjectives

Now, and only now, build a shortlist of three or four. Here is what belongs on it.

Agencies that talk in pounds, with results anchored to named clients you could plausibly ring up. Agencies that show their working, ideally on live dashboards rather than quarterly slide decks. Agencies whose pricing you already roughly know, because they told you before a salesperson was involved. And agencies that fit your size and patch: for a business in our part of the world, our honest guide to choosing the best marketing agency in the North East covers the local landscape, including why the strongest local team often beats a bigger name further south at a 15 to 25 per cent lower price.

What does not belong on the shortlist: agencies chosen purely because a friend uses them, agencies whose case studies have no numbers, and agencies that are "right for everyone". An agency with no wrong-fit clients is an agency that has never told a prospect the truth.

Step six: interrogate the shortlist

Take the same five questions into every meeting, and write the answers down.

What will this cost, and exactly what is included? What is not included, and are ad spend and tools passed through at cost? What return do you expect, in revenue, and by when? How will I see what you did, and how often? And who is not a good fit for you?

A strong agency answers all five without flinching. Then watch for the red flags that should end a conversation regardless of how good the chemistry feels: a guaranteed ranking or an exact number of promised leads, because nobody honest can promise either. Activity talked about endlessly with outcomes never mentioned. A long contract with no explanation of why the term fits the work. And no answer to the wrong-fit question.

Notice the balance here. A 13-month commitment with a clear reason, month one diagnostic, compounding thereafter, is a fair structure. The same commitment with no reason attached is a trap. The difference is whether the agency can explain why, in plain English, before you sign.

Step seven: judge the first 90 days properly

Choosing well includes checking your choice, and the first 90 days tell you nearly everything.

In a good first month, tracking goes in before promises come out. A baseline gets written down. Someone visits you in person. A channel-by-channel plan appears with numbers and timeframes attached. By month three you should be able to answer three questions inside a minute of opening any report: what was spent, what came back in pounds, and whether that is better or worse than last month.

What you should not expect is transformed revenue by week six, and an agency that promised you that should worry you more than one that promised realism. Paid channels show signal in 30 to 60 days; SEO and content compound over six to 12 months. The full set of signals, both ways, is in our guide to how to tell if your marketing agency is working , including the 60 second report test worth running every month from month two.

Where Maitland fits, and how to use this guide on us

We wrote this guide because it is the buying process we think the industry should have, and we are happy to be judged by it.

On the steps above: we publish our prices, GROW partnerships start at £2,000 per month with most between £3,000 and £10,000. We are one integrated team across strategy, delivery and optimisation, not a collection under one letterhead, and one team owns one revenue number per client. Month one is a Deep Dive with an in-person visit, tracking and a baseline before anything is promised. The commitment is 13 months, and the reason is printed on everything we produce: compounding needs runway, and each win is built to stack on the last.

The results of working that way: across all our clients in the last 12 months, the average was 52 per cent growth. Altura, a full-funnel partnership of more than 12 months, saw organic traffic rise 828 per cent and organic revenue 372 per cent. And the company we keep, from Newcastle United across more than eight years to Parkdean Resorts and the Metrocentre, is in our case studies where you can check it.

And the honest bit, because step six demands it of us too: we are built for ambitious UK businesses doing £1m to £20m in revenue, investing £2,000 or more per month, who want marketing measured against revenue. If that is not you, we are the wrong choice, and we will say so on the first call.

The easiest way to test everything in this guide is to watch an agency show its working. Book a free performance marketing review . We will look at your current marketing, show you what we see, what it could be worth, and what we would do about it, and you can judge us against every step above while we do it. If you already know what you need, get in touch and we will give you a straight answer on fit, both ways. No pitch. No follow-up unless you want one. You still walk away with something useful.

Market cost ranges and channel timeframes are indicative UK figures as of July 2026. Client results are specific to the named client and are not a guarantee of future performance. The 52 per cent average growth figure is correct as of July 2025.

Frequently Asked Questions

How do I choose a marketing agency in the UK?

Work through seven steps: confirm an agency is the right vehicle at all, define your goal and budget, learn the market prices, decide between one team and several specialists, shortlist on evidence rather than adjectives, ask every agency the same five questions, and judge the first 90 days against clear signals. Each step has a deeper guide linked in this article.

What should I look for in a marketing agency?

Results in pounds anchored to named clients, working shown on live dashboards, honest pricing available before a sales call, genuinely integrated channels rather than internal silos, and the willingness to tell you when you are not a fit. Those five signals separate strong agencies from busy ones faster than any pitch deck.

What questions should I ask a marketing agency before signing?

What will this cost and what is included? What is not included? What return do you expect, in revenue, and by when? How will I see what you did? And who is not a good fit for you? Strong agencies answer all five without flinching; an agency that dodges the first two has answered a bigger question.

What are the red flags when choosing an agency?

Hidden pricing, guaranteed rankings or promised lead counts, endless talk of activity with no mention of outcomes, long contracts with no explanation of why the term fits the work, and no answer to "who are you wrong for?". Any of these should end the conversation, whatever the chemistry.

How quickly should a new marketing agency show results?

Expect tracking, a baseline and a clear plan inside the first month, and readable reporting from month two. Paid channels should show meaningful signal within 30 to 60 days; SEO and content compound over six to 12 months. An agency promising transformed revenue by week six is a bigger risk than one promising realism.