Five advertiser problems media buying agencies can still solve

The commercial opportunities for media buying agencies lie in five advertiser problems that buyers will pay to solve: choosing between fragmented video routes, governing retail media, seeing inside proprietary buying, joining measurement across systems and activating addressable audiences under consent constraints. A growing channel is only a signal. The sellable service must still be specific.

What to take away

Sellable services solve specific advertiser problems, not just growing channels.
Video planning must document differing definitions and prevent duplicated reach being counted as extra people.
Retail media growth supports investigation, not a guarantee of advertiser returns.
Proprietary buying needs contract design, inventory disclosure, approval workflows and post-campaign reconciliation.
Test demand with existing buyers before building a department around a market headline.

Video planning across unlike inventories

Ofcom's Media Nations 2026 describes a UK viewing market spanning broadcast television, broadcaster video on demand, subscription services and video-sharing platforms. These environments use different availability, buying and measurement conventions.

An agency can earn a role by translating a client objective into comparable reach, frequency, context and outcome questions. The opportunity is not to promise a single perfect video metric. It is to document where definitions differ and prevent duplicated reach from being presented as additional people. A familiar case is a plan that counts the same viewer once on broadcast and again on a broadcaster's on-demand service, then reports the combined figure as extra reach.

Retail media governance

IAB UK's Digital Adspend 2025 reported growth in the UK retail media category during 2025. That supports investigation of the channel, not a guarantee of advertiser returns. In the UK that growth runs through grocery, pharmacy and marketplace networks such as Tesco Media and Insight, Nectar360, Boots Media Group and Amazon Ads, alongside specialist commerce media platforms such as Criteo.

Useful services include retailer-by-retailer planning rules, clean naming conventions, access control and reconciliation of retailer reports with the advertiser's own sales records. Agencies should identify which results come from a media owner's system and which have been independently checked.

Scrutiny of proprietary buying

Agency-packaged inventory can combine media, data and technology. ISBA's 2026 note on proprietary media transparency says advertisers need granular information that distinguishes these arrangements from other buying.

That creates room for contract design, inventory disclosure, approval workflows and post-campaign reconciliation. Transparency should be a deliverable with named fields, not an adjective in a proposal: gross media cost, data cost, technology fee, agency fee and the working-media share, alongside inventory source, publisher domain, audience definition and the basis of the agency's remuneration. The agency must be candid about whether it acts for the client or trades on another basis.

Measurement that survives platform differences

The IAB UK measurement hub points buyers towards digital standards and the UKOM digital audience measurement framework. Agencies can help advertisers create a measurement dictionary that fixes, for every metric, the definition, the source system, the attribution window, the inclusion and de-duplication rules and the named owner, so that platform attribution can be separated from broader evaluation.

This work becomes more valuable when a client has several agencies or internal teams. A practical product might be a monthly discrepancy review that traces material differences in impressions, conversions and spend to definitions or data loss. It should not claim causal lift without a suitable design.

Privacy-aware activation

The ICO's final guidance on the use of storage and access technologies now addresses online advertising and measurement under UK rules. It sets out the regulator's expectations for the three new exceptions to the regulation 6 PECR prohibition on storing and accessing information on someone's device, after regulation 6 was changed through the Data (Use and Access) Act and the draft guidance was revised in July 2025. Advertisers therefore need buying plans that account for consent, tagging and data-purpose constraints before forecasting addressable audiences.

An agency opportunity exists at the join between media planning and privacy implementation. The service can map dependencies, offer contextual alternatives and document the effect of unavailable signals. Legal conclusions remain with qualified reviewers.

Test demand before building a department

Interview existing buyers about decisions they cannot currently make, then ask what record would let them approve spend. Pilot one narrowly defined deliverable with a fixed boundary and review it after use. Do not hire around a market headline alone.

The best opportunity is the recurring decision for which a client lacks reliable evidence or ownership. Define that gap, the source systems and the acceptance test before adding it to the agency's offer.

Price the investigation separately from any later activation so the recommendation is not rewarded merely for increasing spend.

Before you act

List the advertiser problems a client has already funded work around, with the systems that evidence each one.
Write the fields your transparency report will carry and name an owner for each field.
Fix the definitions, source systems and de-duplication rules in the measurement dictionary.
Check consent, tagging and purpose limits against regulation 6 PECR before forecasting addressable audiences.
Pilot one deliverable with a fixed boundary and an acceptance test agreed in advance.
Price the investigation separately from later activation.

Common questions

What should an agency do before building a new department?

How can an agency help with video planning across different platforms?

Translate a client objective into comparable reach, frequency, context and outcome questions. Document where definitions differ and prevent duplicated reach from being presented as additional people. The opportunity is not to promise a single perfect video metric.

What does ISBA guidance say about proprietary media?

ISBA's 2026 note on proprietary media transparency says advertisers need granular information that distinguishes these arrangements from other buying. This creates room for contract design, inventory disclosure, approval workflows and post-campaign reconciliation. The agency must be candid about whether it acts for the client or trades on another basis.