Choosing a GEO agency is not like choosing an SEO agency. The discipline is newer, the market is less mature, and the gap between agencies that genuinely understand Generative Engine Optimisation and those that have bolted it onto an existing service catalogue is significant. This guide is designed to help UK businesses — particularly those in regulated sectors — evaluate GEO agencies with confidence.
We are a GEO agency ourselves, so we have an obvious interest here. But this guide is written to help you make a good decision, even if that decision is not MarGen. A well-informed buyer is better for the entire market.
What to Look For
1. GEO as a Core Discipline, Not a Bolt-On
The first question to ask any GEO agency is: how long have you been doing this, and is it your core business?
Many agencies added GEO to their service pages in 2025 when the term gained traction. Their teams are SEO specialists who have read about GEO, not practitioners who have built and iterated methodologies. There is nothing wrong with SEO expertise — it is a related discipline — but GEO and SEO are not the same thing, and an agency that treats them as interchangeable will produce SEO outcomes, not GEO outcomes.
Look for agencies where GEO is the primary or sole focus. Where the methodology was built for AI citation, not adapted from page ranking.
2. A Defined Methodology
Ask to see the methodology. Not a list of services — a structured, sequential methodology that explains how AI citation authority is built step by step.
A credible GEO methodology should include:
- AI visibility auditing across multiple platforms
- Entity signal mapping and remediation
- Content restructuring for AI extractability
- External authority building
- Ongoing citation monitoring and measurement
- A defined timeline (typically 90 days for initial implementation)
If the agency cannot articulate a clear methodology, they are making it up as they go.
3. Sector-Specific Expertise
GEO for a financial services firm looks materially different from GEO for an e-commerce brand. GEO for a law firm requires understanding SRA transparency rules. GEO for healthcare requires clinical credibility and CQC compliance awareness.
Ask whether the agency has worked in your sector. Ask them to explain the regulatory constraints that apply. If they cannot discuss FCA requirements, SRA rules, or CQC standards fluently, they do not understand your environment well enough to operate safely within it.
4. Citation-Based Measurement
The KPIs for GEO are fundamentally different from SEO KPIs. If an agency reports progress using rankings, organic traffic, and backlink counts, they are measuring SEO, not GEO.
Credible GEO measurement includes:
- Citation frequency — how often your brand appears in AI-generated answers across ChatGPT, Perplexity, Google AI Overviews, and Claude
- Citation accuracy — when cited, is the information about your firm correct?
- Entity recognition — do AI models recognise your brand as a distinct entity with defined expertise?
- Query coverage — what percentage of relevant buyer queries produce citations to your firm?
- Competitive citation share — how does your citation rate compare to named competitors?
Ask to see a sample report. If it looks like an SEO report with “AI” added to the headers, it probably is.
5. Case Studies With Specific Metrics
Any agency can claim to deliver results. Ask for case studies that include:
- Baseline metrics (starting citation rate)
- Timeline (how long the engagement ran before results were measured)
- Specific outcomes (citation rate improvement, query coverage, platform breakdown)
- Sector relevance (results from a similar industry to yours)
Vague case studies that say “we improved AI visibility” without specific numbers are not evidence.
Red Flags to Avoid
“We guarantee AI citations”
No agency can guarantee that a specific AI platform will cite a specific brand. AI models make citation decisions dynamically based on the query, the available signals, and their own training and retrieval processes. An agency can build the signals that make citation more likely — and measure the results — but guarantees are a red flag.
“Our AI SEO package covers GEO”
If GEO is buried inside a broader “AI SEO” package alongside traditional SEO, AEO, technical audits, and content marketing, it is probably not receiving the specialist attention it requires. GEO needs dedicated methodology and measurement, not a line item in a general package.
“We work with every sector”
GEO is most critical — and most complex — in regulated sectors. An agency that claims to serve every sector equally is unlikely to have the regulatory depth that financial services, legal, healthcare, or construction clients need.
No mention of compliance
If you are a regulated business and the agency’s proposal does not address compliance prominently, they do not understand your operating environment. Every piece of content, every entity signal, every external citation must comply with your sector’s regulatory framework. An agency that does not recognise this creates risk.
Pricing based on hours rather than outcomes
Traditional agency pricing is based on time — hours allocated to various activities. GEO pricing should be tied to methodology phases and measured outcomes. You are paying for citation authority, not for someone’s time.
Questions to Ask in an Evaluation
- What is your GEO methodology? Look for a structured, sequential framework, not a list of tactics.
- How do you measure success? Citation frequency, entity recognition, and competitive citation share are the right answers. Rankings and traffic are the wrong answers.
- Have you worked in my sector? Sector expertise in regulated industries is not optional.
- How do you handle compliance? The right answer is “it is integrated into our methodology from the start.” The wrong answer is “your legal team reviews our work.”
- What does a typical 90-day engagement look like? A clear timeline with defined phases and milestones.
- Can you show me your audit process? The audit should cover multiple AI platforms and test the specific queries your buyers ask.
- What happens after 90 days? Citation authority compounds — the answer should describe ongoing monitoring and expansion, not a project that ends.
- How are you different from a traditional SEO agency? If the answer is “we do everything an SEO agency does, plus GEO”, they are probably an SEO agency with a new service line.
How to Compare Proposals
When you have proposals from multiple agencies, compare them on:
| Criterion | What good looks like |
|---|---|
| Methodology | Structured, sequential, specific to GEO |
| Measurement | Citation-based KPIs, platform-specific tracking |
| Sector expertise | Demonstrated understanding of your regulatory environment |
| Compliance | Integrated into methodology, not an afterthought |
| Case studies | Specific metrics from comparable sectors |
| Pricing | Tied to methodology phases and outcomes |
| Timeline | 90-day foundation with ongoing programme |
Further Reading
- Best GEO Agencies UK 2026 — our comprehensive comparison of UK GEO agencies
- How Much Does a GEO Agency Cost? — 2026 pricing guide
- How MarGen’s GEO Model Differs — our methodology-led, compliance-first approach
- What Regulated Sector CMOs Are Being Asked in Agency Pitches — the questions you should be ready to answer
- GEO vs AEO: Clearing Up the Confusion — understanding the distinction before evaluating agencies
MarGen’s Position
MarGen is a specialist GEO agency for regulated UK businesses. Our Synaptic Authority Engine is a methodology built specifically for AI citation authority, not adapted from SEO. We focus exclusively on financial services, legal, healthcare, and construction.
If you are evaluating GEO agencies and want to include MarGen in your consideration, start with a conversation. We will begin with an audit — no commitment, no pitch deck — so you can see exactly where your AI visibility stands before making any decisions.