UK display advertising forecasts: Online's growth masks challenges

Recently awakened sleeping giant Amazon is using its vast resources to ramp up an aggressive open web stance, offering advertisers low take rates through its DSP.

Adtech firms risk destroying their own margins in response, so are increasingly extending their positions across the value chain as they compete to offer ‘end-to-end’ services.

2026 will be make or break for the agency holding company model as Omnicom resets and WPP’s need to see the benefits of its turnaround becomes urgent.

Advertising is in a structural shift due to AI and the video boom. AI tools are growing the reach and capabilities of smaller advertisers, fuelling robust demand. 

WPP must challenge Publicis’s dominance in 2026 and show it is positioned to benefit from AI even as Omnicom and IPG combine to create a new global behemoth.

Amazon is taking the fight to adtech by strengthening its connected TV and retail media positions. Adtech is building partnerships and becoming more end-to-end in response.

Defined roles within the advertising ecosystem are a thing of the past: everyone is adapting by building out functionality to claim share as the constants underpinning advertising—attribution, discoverability, and regulation—change.

There is a new wave of M&A, partnerships and developments from agencies, adtech, and big tech in data and AI, as all sides position themselves to reshape the terms of online advertising at a time of maximum uncertainty.

Big tech platforms are leveraging their scale and AI investments in attempts to reset broad swathes of the market. Publishers are exposed; their way forward relies on asserting their value through direct audiences and collaboration on sector-wide innovations

From the depths of 2023, advertising expenditure on legacy media rose moderately in 2024, on the back of an uptick in real private consumer expenditure thanks to lower inflation and reduced costs of credit—the outlook for legacy media is about the same for 2025.

Online stands apart from legacy media due to the growth of ecommerce—driven by both goods (over 26% of retail sales) and services such as travel, as well as intense competition among platforms (Amazon, Shein, Temu)—with double-digit growth in 2024 set to continue in 2025.

Television remains the most effective medium for brand advertisers—despite the decline in viewing—with broadcasters’ digital innovation and SVOD ad tiers providing greater targeting alongside the mass broadcast reach.

The UK’s ‘zombie’ economy—largely flat since March 2022—is due to the cost-of-living crisis weighing on households, with this exacerbated in 2023 by the rising cost of credit. Real private expenditure growth will be weakly positive in 2024 before strengthening in 2025 as headwinds recede

Our 2023 forecast of a nominal rise but real decline in display advertising was realised, with TV’s revenues falling while digital display rose. Advertiser spend online is justified by the channel’s size and growth, worth an estimated £406 billion in 2023

For 2024, much lower inflation and mildly positive real private expenditure growth points to 3-4% display advertising growth, with a stronger recovery anticipated in 2025