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Part of How to plan connected TV frequency capping in the UK
How to plan connected TV frequency capping in the UK
Plan connected TV frequency capping for UK campaigns: choose the audience unit, set a campaign cap, match it to each CTV environment and review reach weekly.
What to take away
- Set a campaign-level frequency cap for every connected TV buy first, then add platform ceilings. Start with a conservative daily cap and a weekly ceiling, then relax them only if reach suffers.
- Ofcom's advertising minutage limits govern how many ad minutes a channel may broadcast. They do not limit how often one household sees your ad, which is the gap a frequency cap fills.
- Separate caps by environment. Broadcaster VOD, FAST channels and ad-funded tiers have different session lengths and ad loads.
- Review reach and completed views weekly. Tighten the cap when reach growth stalls and repetition rises.
- Keep audience data lawful under UK GDPR if you use device or household identifiers.
Why frequency capping matters in UK CTV
UK connected TV buying has moved from test budgets to always-on activity. More ad-funded tiers and FAST channels, Pluto TV and Samsung TV Plus among them, mean a viewer can meet the same brand across several apps in one evening. Without a cap, budget shifts from reach to repetition.
Ofcom's broadcasting remit, including advertising minutage, comes from the Communications Act 2003. The minutage limits themselves sit in Ofcom's Code on the Scheduling of Television Advertising (COSTA), which caps the ad minutes a channel can run. Those limits do not stop one viewer seeing the same ad across different services, and that gap is where frequency capping earns its place.
The ASA's CAP Code sets content standards for ads in those breaks. Content compliance is separate from frequency management, but both shape viewer experience. A strong ad shown too often can annoy people as much as a weak ad.
Frequency and viewability interact. A low viewability rate wastes impressions and makes a cap harder to judge, so review CTV ad viewability standards before changing frequency. Third-party verification from DoubleVerify, Integral Ad Science and Pixalate is where most UK buyers read CTV viewability and invalid-traffic rates.
Build a campaign-level cap
- Define the audience unit. Decide if the cap applies to a household, a device or a logged-in account. Household caps suit shared TVs; device caps fit mobile extensions.
- Pick a starting cap. Set it from your own reach target, past flight data and the ad load of the platform rather than from a published benchmark: an awareness buy can start tighter, while direct response usually needs a higher daily cap so enough viewers see the ad to act. Record the figure you choose so the next flight can test against it.
- Set one campaign ceiling across all CTV placements, applied in your buying platform — Display & Video 360, The Trade Desk or whichever DSP you use. This stops an app-level cap from being undermined by another app in the same buy.
- Add platform overrides. Raise the cap only where inventory is scarce or completed views are strong. Lower it on apps with heavy repetition.
- Record the cap, audience unit and review date in the campaign brief so buyers and planners apply it the same way.
Match controls to the CTV environment
One cap rarely fits every CTV environment. Broadcaster VOD, FAST channels, ad-funded subscription tiers and addressable buys differ in session length, ad load and how the cap is enforced, so match the control to the environment before you launch.
Match controls to CTV environment
Which CTV environment is this placement?
Broadcaster VOD -> campaign cap plus platform override
FAST channel -> daily cap with creative rotation
Broadcaster VOD — ITVX, Channel 4's streaming service, Channel 5's My5 and STV Player — runs regulated minutage and usually shorter sessions, so a weekly ceiling does most of the work. FAST channels such as Pluto TV and Samsung TV Plus can run longer ad pods, so a daily cap matters more than a per-break cap. Ad-funded tiers such as Netflix with ads, Amazon Prime Video's ad-supported tier and Disney+ limit ad load already. Sky AdSmart is a different case again: it is Sky's addressable TV platform, sold across channels rather than as a single app, so give it its own ceiling inside the campaign cap.
Frequency caps also connect to fraud controls. Invalid traffic can inflate apparent frequency without reaching real viewers, so review connected TV ad fraud prevention before you cut reach.
Review, test and reduce ad fatigue
Set a weekly review. Compare reach, average frequency and completed views by platform, using BARB's UK TV and broadcaster VOD reporting for broadcaster inventory and platform and verification reporting for FAST and app-based buys. If reach is flat while frequency climbs, tighten the cap or rotate creative.
Use a fatigue check. A rising skip rate, falling completion rate or negative brand search trend can signal overexposure. Act on two signals, not one.
Test one change at a time. Lower the daily cap for a fortnight, keep weekly caps steady and hold budget flat. If reach rises without a fall in completed views, keep the tighter cap. Document each change so the next flight starts from the tighter rule.
Where frequency capping relies on personal data, the UK GDPR applies: you need a lawful basis under Article 6, and the ICO's Guide to the UK GDPR explains how legitimate interests and transparency duties work in practice. That matters when you combine CTV exposure data with CRM records.
What is a good frequency cap for UK CTV?
There is no universal number, so choose one you can defend from your own data. Cap at campaign level, set the opening figure from your reach target and the ad load of each environment, and keep it tighter where repetition is heaviest, such as FAST channels. Change it only on weekly reach and completed-view evidence.
Should I cap across all CTV platforms or per platform?
Cap across the whole campaign first. Then add platform ceilings where inventory, session length or ad load differs, so one app cannot exhaust your frequency budget.
How does frequency capping interact with UK data protection law?
If you use personal data to identify a household or device, you need a lawful basis and clear transparency. The ICO's Guide to the UK GDPR covers consent, legitimate interests and individual rights.
