TL;DR (for busy CMOs)
What’s changing: From March 2026 Channel 4 required closed‑captions on all new advertising creatives, across both linear and streaming (including sponsorship idents). Plus, ITV announced in September that they’ll require all advertisers to carry closed-captions by January 2027.
Why it matters for your brand: Subtitled ads improve reach, perception and accessibility with audiences who use captions (whether they need to or prefer to).
What to do now: Update brand/production guidelines, budget for closed captions (£200 per TVC with us) and talk to the agencies you work with.
The mandate & ‘closed captions’ explained
It’s official: Channel 4 announced that all ads and sponsorship idents airing on their channels from 1st March 2026, on both linear and streaming platforms, must carry closed captions.
“This landmark step ensures that our advertising is inclusive of the Deaf and hard of hearing communities, as well as viewers who benefit from enhanced accessibility. By setting this new standard, we’re inviting all our brand partners to join us in creating communications that truly reach and reflect the whole of the UK.”
Furthermore, ITV announced that they too will make closed caption subtitles mandatory for all advertisers by January 2027.
Closed captions are on‑screen text that represent all audible elements of an ad’s soundtrack; both speech and sounds. Unlike open/burned‑in captions, closed captions are optional, meaning they remain hidden until the viewer turns them on, typically via the remote control or app settings. These should be supplied as a separate file alongside your master.
Why now?
Well, the industry has been changing since we first wrote about this topic back in 2022. We’ve seen rising expectations – driven in part by Ofcom’s Access Services framework – and increasing pressure from across the sector to act. The creation of the Ad Accessibility Network shows how far momentum has advanced.
Real change, though, needed a major broadcaster to lead – and Channel 4 stepped up as the first. They committed to fully accessible advertising, invested in ensuring 100% of their streaming platform carries subtitles in 2026, and continued to drive representation through their Diversity in Advertising Awards, already providing £10 million of inclusive media space.
And with ITV later joining them with a similar commitment, we can now only expect this momentum to continue in the same direction across the industry.
Why CMOs should care (beyond compliance)
- Reach & inclusion: In the UK, over 18 million adults are deaf, hard of hearing or have tinnitus, but subtitles are also widely used by people without hearing loss. In fact, 18% of the UK population – that’s 7.5 million people – have reportedly used them, with young people being almost 4 times more likely to. Ultimately, reaching a greater population of consumers with your brand messaging reduces the risk of wastage with your existing media buy. Accessibility isn’t a compliance exercise anymore; it’s a growth strategy.
- Brand perception & DEI proof: It signals that you genuinely value inclusivity – something that consumers now expect from advertisers, as 72% of the UK think that ads should be subtitled. This visible DEI proof shows that your brand values align with those of a modern audience, driving lasting positive sentiment.
- Future‑proofing: Today the rule is specific to Channel 4 (soon to also include ITV) but Ofcom guidelines extending to VoD – and Channel 4’s leadership – could suggest rising expectations across platforms and publishers elsewhere. Making subtitles your default in the UK now could potentially save you operational inefficiencies later.
What needs to change in your marketing machine now
- Update brand guidelines to mandate captions for all new UK linear TV and VoD creatives.
- Bake accessibility requirements into agency Statement of Works / contracts and campaign briefs, ensuring that it’s costed, planned and delivered as part of the core production workflow, to avoid downstream friction later in the process.
- Add a closed captions pre‑flight QC step into the final pre-delivery checklist, so that nothing goes live without a closed caption file containing subtitles that are readable, compliant and harmonious with the creative.
- Plan your creative with captions in mind from the outset, ensuring that they work together with the creative effectively, to enhance – rather than obstruct – the idea. For example, keep the lower third clear so that captions are legible and don’t obstruct anything key in the creative.
Planning your budget & timelines
With Clearcast subtitles:
- Unit cost: £200 + VAT per TVC. And any re-edits the subtitles need because your ad requires further edits, are included at no extra cost.
- Turnaround time: This can vary, but usually within a few hours (often just 1hr). In The Clearcast Library, your subtitles can be created in parallel with the clearance process, meaning you don’t need to wait until after the ad is fully cleared to get them done, saving you precious time at a crucial point.
Note: to use Clearcast subtitles, you’ll need to choose Clearcast Delivery as your delivery partner.
What happens if you don’t add closed captions by the deadline
- Operational risk: Non-compliant ads may not be accepted by Channel 4 (please contact 4sales@channel4.co.uk or your usual rep to discuss as necessary).
- Reputational damage: Brands that fail to comply will be visibly out of step with audience and industry standards – raising the reputational cost of inaction.
Since March, closed caption subtitles stopped being a nice‑to‑have and became a brand baseline. Make subtitles your default across UK TV and VOD now.
Further resources
- More information from Channel 4
- The business case for accessible advertising
- How to order Clearcast Subtitles in The Library
- RNID – National charity for hearing loss
- Clearcast ad Audio Description
By Alyx Leeming, Marketing Engagement & Nurture Lead