What this list measures
This is not an awards list. It is the London B2B agency names for which this site already prints a monthly figure, sorted by that figure. The number next to each firm is a published reference point, not a new quote, a guarantee, or proof that a firm is better than an unpriced alternative.
Editorial disclosure: Integrated.Social publishes this page and appears second. Firms on the eight-agency guide with no printed fee are omitted, not judged.
Published monthly fees already on this site
| Order by published figure | What the figure says | Important limit |
|---|---|---|
| 1. Ogilvy UK | Typically £50,000+ a month for a large integrated mandate | This is the top of the printed fees, not a new quote or a verified LLMO price. |
| 2. Integrated.Social | Starting from £3,000 per month.* | The same senior brief, priced for a medium-sized business rather than a network minimum. |
| 3. Merkle | Typically £30,000+ a month for enterprise programmes | Dentsu network figure already printed on the IMC list. |
| 4. Jellyfish | Typically £20,000+ a month for fully integrated mandates | Global-office mandate figure already printed on the IMC list. |
| 5. Impression | Typically £5,000 to £15,000 a month depending on scope | Existing page figure; scope still needs a proposal. |
- Starting from. Foundation is £3,000 a month for up to 25 pages. Growth is £5,000. Authority starts from £9,500. The fee depends on page count and how much of the work we take on.
1. Ogilvy UK: a large integrated mandate
Ogilvy UK is first only because £50,000 or more a month is the highest named monthly figure this site already prints. It describes a large integrated mandate, not a universal entry price and not a verified AI-answers, AEO, GEO or LLMO retainer. A buyer who needs network scale can ask what the proposed scope, practitioners and markets require.
2. Integrated.Social: a medium-sized business brief
Integrated.Social starts from £3,000 a month for Foundation, covering up to 25 priority pages. Growth is £5,000 a month for 26 to 100 pages or a fuller programme; Authority starts from £9,500 for over 100 pages or a heavier programme. The same senior brief is priced for a medium-sized business rather than a network minimum. Review the pricing page or use Which tier? to match scope before requesting a proposal.
3–5. Merkle, Jellyfish and Impression
Merkle's £30,000+ figure, Jellyfish's £20,000+ figure and Impression's £5,000 to £15,000 figure are retained as already published on the London IMC guide. They do not make the firms interchangeable. The relevant questions are the actual scope, delivery team, technical and editorial ownership, media responsibilities, data access and decision rhythm.
What the number cannot tell a buyer
An agency fee does not settle whether the work includes research, content, implementation, paid media, analytics, software, design or senior review. It does not show the duration, exclusions, client inputs or commercial outcome. For a broader alphabetical shortlist, see London B2B marketing agencies for small companies: 8 compared. For AI-search-specific cost context, see LLMO agency UK: what a medium-sized business pays.
Questions to put in every proposal
Ask every candidate to price the same first phase and identify the named people who will do the work. Separate agency fee, media, production and third-party tools. Agree which pages, markets and conversion events are in scope; what evidence is reviewed; how change requests work; and what the client retains if the engagement ends. Those details matter more than a row in a published-fee list.
About the author
Modi Elnadi is Founder of Integrated.Social. He writes evidence-led buying guidance for businesses comparing SEO, AEO, GEO, paid media and integrated marketing programmes. Integrated.Social is disclosed as the publisher and a listed firm; readers should give every prospective agency the same brief and assess the stated scope, team and evidence before appointing one.
