Best GEO Agencies in the UK: Seven Agencies to Consider

Quick answer

The selection of the best GEO agency for businesses depends on their needs to integrate technical SEO with content marketing and digital PR and entity optimisation and AI visibility reporting. The listed providers in the UK offer generative engine optimisation services which they have made publicly available through their official websites. The SEO services of UK providers named Castle and Blue Array and Found and Screaming Frog and Varn and Impression and The SEO Works are available for public consumption.

The guide presents a side‑by‑side comparison of their publicly described capabilities. The publication comes from Castle which appears in the list so businesses need to apply the selection framework while conducting independent verification of each agency’s current service offerings and evidence and commercial compatibility.

How these GEO agencies were selected

The selection list derived from evidence which anyone can access during the September 2026 review period. To be included, an agency needed a dedicated UK-facing GEO or AI search service and a published description of its approach.

The comparison considers five areas:

• Technical foundations: The system depends on crawlability and indexation
• Content and entities: The content follows answer-led formatting while the structure shows clear entity relationships
• Authority: digital PR activities together with link building and third-party mentions
• Measurement: The system tracks prompts while it measures citations and mentions
• Integration: GEO needs to link its system with SEO platforms and all other marketing channels for successful results

The agencies are not presented as a definitive league table. The public service website fails to provide complete information about service delivery quality and staff availability and customer service results. Buyers need to show existing examples and reporting data before they can make their selection.

1. Castle

Best suited to: The solution serves businesses which need to operate AI SEO and GEO and AEO and traditional SEO under a single commercial program management system.

Castle offers a GEO service together with AI SEO and AEO and traditional SEO.

The research by Castle shows how ChatGPT and Google AI Overviews and Perplexity and Copilot and Gemini and Claude systems identify and recommend the work. The unified system provides value to businesses which want to avoid handling different suppliers for their technical SEO work and content development and digital PR activities and AI visibility needs.

Questions to ask: You should obtain the suggested prompt collection along with the reporting structure and initial 90-day objectives and industry-based proof that applies to your organization.

2. Blue Array

Best suited to: Larger organisations need an expert organic-search agency which provides a specified GEO service.

They provide an exclusive generative engine optimisation service which includes content discoverability optimization and technical optimisation and multi-model distribution and monitoring services. The service page includes details about citation and mention analysis together with competitor benchmarking and sentiment analysis services.

The agency uses organic search to create a powerful brand while GEO serves as the next step in SEO development. Businesses which require their generative visibility to operate within an established search system would find this solution suitable.

Questions to ask: Identify the proprietary frameworks and reports which clients can access while determining the specific responsibilities of Blue Array and internal teams during implementation.

3. Found

Best suited to: Larger brands seeking to connect GEO with their data and digital PR activities through cross-channel strategic planning.

Found describes its approach through an “Everysearch” methodology and its Luminr visibility platform. The company offers GEO services which include citation analysis and audit services and entity optimization and structured question and answer systems and schema development and citable resource generation and digital public relations and large language model performance monitoring.

Found offers a complete range of services which includes paid media and data management and creative work and digital public relations that benefit brands who want to work with an agency for multiple services instead of just one specialized area.

Questions to ask: Inquire about the connection between Luminr reporting and revenue generation and determine which data sets are available for export and identify the GEO programme elements that fall under the specified retainer.

4. Screaming Frog

Best suited to: Websites with advanced technical requirements and teams which specialize in complete website scanning and log analysis and technical SEO methods.

Screaming Frog operates as an agency while its SEO Spider software has become their most recognized product. The published AI search optimisation service offers GEO strategy implementation together with technical optimisation and content development and digital PR and AI visibility tracking services.

Businesses operating extensive facilities should select this solution because it stems from technical roots which make it suitable for their needs. The system provides an ideal solution for businesses which operate multiple facilities and require advanced rendering and complex site management.

Questions to ask: Verify the distribution of advisory work against implementation tasks and determine the amount of content and PR assistance you will receive and establish if the partnership will follow a project-based structure or continue as a long-term relationship.

5. Varn

Best suited to: Organisations that want to work with a proven search agency which provides dedicated GEO services and uses research-based methods.

Varn presents a specialized GEO agency service which explains generative visibility through its complete SEO and data service offerings. The company focuses on assisting brands to show up in AI responses through their continued use of organic search methods and strategic planning.

The agency will attract businesses which support continuous testing because they want to include GEO tracking within their complete search connection.

Questions to ask: Show me examples which demonstrate your prompt monitoring system and source analysis operations and Varn’s method to identify actual GEO effects from general organic search growth.

6. Impression

Best suited to: Mid-market and enterprise brands that want GEO integrated with SEO, digital PR, analytics and wider performance marketing.

Impression’s published GEO service offers a unified platform which brings together brand development with content planning and advanced GEO visibility tracking and LLM performance analysis. The document presents a system which monitors brand mentions and citation links and tracks customer sentiment and referral activities and conversion metrics while Tensar has published an AI Overview case study.

The agency offers a comprehensive range of services which enable clients to use their SEO and PR teams as a unified operational unit but buyers need to verify team member experience levels and their scheduled working hours.

Questions to ask: Determine which metrics can be verified independently while learning about the system that tracks prompt timing and the process for linking GEO operations to pipeline development and revenue generation.

7. The SEO Works

Best suited to: Organisations needing GEO implementation through a UK-based SEO agency which provides complete organic search solutions.

The SEO Works offers a specialized generative engine optimisation service as part of its SEO service package. The position would attract businesses which want to expand their existing SEO program into AI search while keeping their SEO and AI search operations together.

Questions to ask: The team needs to specify which active monitoring AI platforms exist and determine if digital PR falls under their responsibilities and identify the standard AI performance metrics which get reported.

Comparison table

How to choose the right GEO agency

Ask for a real baseline

Ask each agency how they will measure the current visibility of your website across a fixed set of commercially relevant prompts. Avoid agencies that provide only ad hoc screenshots of your website’s visibility.

Check implementation depth

Some agencies offer only strategy. Others will implement their recommendations, including technical SEO, content SEO, digital PR, and reporting. Check with each agency to find out who will implement each recommendation before you compare prices.

Examine off-site capability

Local SEO cannot be confined to your website. Ask each agency what they will do outside of your website to improve your local SEO. This might include digital PR, citations, partnerships, and reputation management.

Demand commercial measurement

While mentions of your website are valuable, ask each agency how they will track qualified traffic, conversions, leads, and revenue. OpenAI’s analytics and referral tags can track these metrics, although not every AI-generated SEO journey will produce a direct click on your website.

Look for honesty about uncertainty

Ask each agency how they will improve your website’s visibility in ChatGPT, Google, Gemini, Perplexity, and other AI search engines. No agency can guarantee results from these platforms, but the best agencies will be honest about what they can and cannot influence.

Questions to include in an agency brief

• Which AI platforms will you monitor?
• How will you build the prompt set?
• What is your starting audit methodology?
• Which deliverables are implemented by your team?
• How do technical SEO, content and digital PR work together?
• What reporting will we own or be able to export?
• How do you track inaccurate brand information and sentiment?
• How will results connect to leads, sales or revenue?
• What evidence can you show from a comparable sector?
• What will be delivered during the first 90 days?

Final recommendation

There is no universally best local SEO agency. Which one you choose will depend on your website, internal team, sector, budget, and whether you wish to implement the recommendations yourself or have the agency take care of it for you.