The short answer: four kinds of work
Strip away the jargon and almost everything a digital marketing agency does falls into four kinds of work.
- Thinking. Research into your customers, competitors and search demand; deciding where growth should come from and which channels fit.
- Making. Producing what the channels need: web pages, articles, ads, emails, videos, landing pages and graphics.
- Running. Operating campaigns and channels week by week: adjusting bids, publishing content, fixing technical issues, testing new ideas.
- Measuring. Setting up tracking, reading the data, reporting to you and changing course when the numbers say so.
Agencies differ mainly in how much of each they offer. Some are strong at making and weak at thinking; others plan well but outsource delivery. For a broader explanation of the channels themselves, see what is digital marketing.
Who actually does the work inside an agency
Knowing the roles helps you understand what you are paying for and ask better questions. In a larger agency you may meet several of these people; in a small studio one senior person may cover several roles.
- Account or client manager: your day-to-day contact, who coordinates work and keeps deadlines.
- Strategist: decides priorities, channel mix and budget split, and owns the overall plan.
- SEO specialist: technical health of the site, keyword research, on-page work and authority building.
- Paid media specialist: runs Google Ads, Microsoft Advertising, Meta or LinkedIn campaigns.
- Content writer or editor: writes pages, articles and emails, often interviewing your experts.
- Designer and developer: landing pages, website changes and creative assets.
- Analyst: tracking, dashboards and interpretation of results.
A useful question for any agency: who will actually work on our account, how senior are they, and how much is passed to freelancers or overseas teams?
What digital marketing agencies offer
The services on offer are broadly similar across UK agencies. What varies is depth, and whether they are joined up.
| Service | What the agency does | What you can reasonably expect |
|---|---|---|
| Strategy | Research, goals, channel choice, budget allocation | A short written plan with priorities and measures |
| SEO | Technical fixes, keyword mapping, content, links | Gradual growth in visibility over months, not weeks |
| Paid search | Campaign build, keywords, bidding, ad copy, testing | Traffic quickly; profitability after a learning period |
| Paid social | Audiences, creative, campaign management | Reach and demand creation; leads vary in intent |
| Content | Planning and producing articles, guides and pages | Material that supports search, email and sales |
| List growth, sequences, newsletters, deliverability | Repeat business and nurtured enquiries | |
| Website and CRO | Landing pages, usability fixes, testing | More enquiries from existing traffic |
| Analytics | Tracking, consent-aware set-up, reporting | Reliable numbers on what produces customers |
A typical month with an agency
Once the set-up phase is over, a well-run engagement has a recognisable rhythm.
- Weekly: campaign checks and bid adjustments, search term reviews, content in production, quick fixes on the website.
- Monthly: a report and a call covering enquiries, sales and costs, what was done, what was learned and what comes next.
- Quarterly: a step back to review the plan, shift budget between channels and agree new priorities.
The first two to three months look different. Expect an audit of your current activity and tracking, research, a plan, fixes to foundations such as conversion tracking, and the first campaigns or content. Results from paid channels often appear in this period; SEO and content usually take longer.
If an agency skips the foundations and launches campaigns in week one, ask how it will know which of those campaigns produce customers.
What digital marketing agencies charge
UK agencies use a handful of pricing models, often combined.
- Monthly retainer: a fixed fee for an agreed scope of ongoing work.
- Project fee: a fixed price for a defined piece of work, such as a strategy, a website or a campaign launch.
- Day rate: time-based billing, common for consultants and specialist work.
- Percentage of ad spend: common for paid media management; check whether the fee rises automatically as spend grows.
- Performance-based elements: fees linked to leads or sales, which can align incentives but need careful definitions.
What drives the cost is the number of channels, how competitive your market is, how much content is produced, the seniority of the people involved and the state of your website and tracking. Ad budgets are paid to the platforms on top. For paid media specifically, our guide to PPC management costs breaks down the fee models in more detail.
What an agency does not do, and what stays with you
Even a strong agency cannot replace certain things only you can provide.
- Your expertise. Credible content needs your specialists' knowledge and time.
- Sales follow-up. An agency can deliver enquiries; converting them into clients is your team's job, and fast follow-up makes a large difference.
- Commercial decisions. Pricing, service range, capacity and which clients you want remain yours.
- Feedback on lead quality. Without it, campaigns cannot be steered towards the enquiries that close.
- Compliance responsibility. The agency should know UK rules such as PECR for email and the CAP Code for claims, but your business remains responsible for its marketing.
An agency should also never own your core assets. Ad accounts, analytics, domain, website and content should be registered to your company, with the agency given access.
Types of agency, and when a different model fits
- Full-service agencies cover most channels plus creative and strategy. Convenient, but quality can vary between departments.
- Specialist agencies focus on one channel, such as search or email. Our pages on search engine marketing, content marketing and email marketing show what specialist depth looks like.
- Sector specialists work mainly for one industry, which shortens the learning curve.
- Founder-led studios keep a small number of clients and senior people on every account.
Sometimes an agency is not the right answer at all. If you mainly need an independent view and a plan your team will carry out, a marketing consultant may fit better.
How to get the most out of an agency
Agency results depend heavily on the client side of the relationship. Companies that get good value from their agencies tend to do a few things consistently.
- Share real numbers. Margins, average client value, conversion rates and capacity let the agency make commercial decisions rather than guesses.
- Name one decision-maker. Work slows down when approvals pass through several people with different views.
- Report back on leads. A simple monthly note on which enquiries became clients is worth more than any dashboard.
- Give access early. Analytics, ad accounts, Search Console, the website and your experts' diaries; weeks lost waiting for logins are weeks of learning lost.
- Agree what success means before work starts, including what will be judged after three months and what only after a year.
- Tell them about changes in prices, capacity, staffing or services. Campaigns that promote a service you can no longer deliver waste money quickly.
Equally, expect the agency to ask for these things. One that never asks about your sales results is probably not steering by them.
How to tell whether an agency is doing a good job
- You understand what is happening. Reports explain results in plain English, including what did not work.
- Numbers connect to revenue. Enquiries, sales and cost per customer appear in every report, not only clicks and reach.
- They challenge you. A good agency questions assumptions and occasionally advises spending less.
- Work is visible. You can see campaigns, pages and changes in your own accounts.
- Promises are realistic. Anyone promising rankings or a fixed number of leads is selling hope.
How Kaptein Beacon works
We are a founder-led studio based in the Netherlands, working remotely with UK companies an hour ahead at most. We take on a limited number of clients so the founder stays close to the strategy and the work. Our focus is search, AI search visibility, websites, branding and Google Ads, measured on enquiries and revenue. More about our approach is on the digital marketing agency page.
Every engagement starts with a paid strategy session. Afterwards we decide whether we take the project on; if so, a proposal with fixed scope and fixed price follows.