Podcast advertising formats: choosing for UK campaigns

What to take away

Pre-roll ads are the cheapest slot and are usually sold on a run-of-network basis; they suit broad awareness goals rather than detailed messages.
Mid-roll ads sit inside the episode where listening is highest, and UK networks usually price them at a premium over pre-roll.
Host-read ads remain the format most UK podcast buyers ask for first, because the presenter's own delivery carries the endorsement.
Format choice should follow the campaign objective and the measurement you can actually run, not the headline cost per thousand.
Every format must be clearly identifiable as advertising under the CAP Code, whatever the delivery style.

How UK podcast ad formats are placed

Most UK podcast inventory is sold in three positions: pre-roll before the episode, mid-roll inside it, and post-roll at the end. Networks tend to bundle positions into a single buy rather than selling slots one at a time.

UK buyers can explore podcast advertising inventory or sales services from providers such as Acast, Audioboom, Spotify, Global and Bauer. Availability varies by show and provider, so ask which positions and delivery methods are available before you book.

Podcast ad placement and delivery

Pre-roll before episode
Mid-roll inside episode
Post-roll at end
Baked-in stays with file
Dynamic insertion serves different advertisers

Placement is either baked into the audio at the edit or inserted dynamically by the network. Baked-in reads stay with the file permanently, which suits an evergreen sponsorship. Dynamic insertion lets a network serve different advertisers as a back catalogue keeps attracting downloads.

Pre-roll ads: cheap reach, short attention

Pre-roll runs before the content begins. Listeners may still be settling in, skipping forward or lining up the next episode, so attention can be limited. A pre-roll works best with one clear idea, such as a brand name or an offer.

Pre-roll also works for testing a script before you commit a larger budget to mid-roll slots. Run the same spot in both positions and compare how many listeners stayed with the episode, not just click counts. See how to test podcast ad creative before you scale spend.

Mid-roll ads: the workhorse slot

Mid-roll sits inside the episode, often after the host has set up the topic. It carries the highest rate on most UK network rate cards because completion is strongest there. By that point, the listener has already chosen to keep listening.

The trade-off is length. A mid-roll usually runs 45 to 90 seconds, and networks often cap how many breaks a show carries. Ask about break load before you buy, because a crowded episode dilutes your spot.

Post-roll ads: the closing slot

Post-roll plays after the main episode content, often near the closing credits. It can suit a final reminder or a simple call to action, but relies on listeners staying to the end. Treat it as a supplementary placement rather than the sole format when the campaign needs to reach listeners earlier in the episode.

Host-read ads: the UK default

A host-read spot is delivered by the presenter in their own voice, usually scripted with them rather than handed over cold. UK buyers ask for the format first because the delivery implies a recommendation rather than an interruption.

Host-read inventory can take more coordination to book. Scripts need approval well before the recording date, and some hosts will decline copy that does not fit their audience. The format still sits under the advertising rules: the CAP Code and its advertising codes require marketing communications to be obviously identifiable as such. The Advertising Standards Authority (ASA) handles complaints about whether ads meet those requirements.

Make the advertising nature clear at the outset of a host-read spot. A spoken disclosure such as “This is an advert for [brand]” tells listeners what they are hearing before the promotional message begins. Agree the wording with the host and check that it is clear in the finished audio.

Produced spots and sponsorship formats

A produced spot, also called a non-host-read or announcer-read ad, uses a recorded voice-over or advertiser-supplied audio rather than the presenter’s personal read. It gives the buyer more control over approved wording and a consistent execution across shows. Choose it when consistency matters more than a presenter’s personal delivery.

A sponsorship credit is a short acknowledgement naming the sponsor; a branded segment is a longer advertiser-funded feature linked to the episode. Agree who writes and approves the segment, and make sure listeners can distinguish the advertising from editorial content.

Choosing a format: a comparison table

The three formats are not mutually exclusive, and the right mix depends on what you can measure once the campaign ends.

Format	Best fit	Choose it when
Pre-roll	Broad awareness or a concise message	The message works before the episode content begins.
Mid-roll	A message that needs more room or context	You want to reach listeners who have chosen to continue with the episode.
Post-roll	A closing reminder or simple call to action	Reaching listeners at the end suits the campaign; do not rely on it alone if the message needs earlier exposure.
Host-read	A message delivered in the presenter’s voice	The host’s delivery and fit with their audience matter, and you can allow time for script approval.
Produced spot	Consistent, controlled wording	You want the same approved execution across shows rather than a presenter’s personal read.
Sponsorship credit or branded segment	Acknowledgement or a longer sponsor-funded feature	You want to associate the brand with an episode or feature, with clear advertising identification.

For broad awareness, consider pre-roll or a mix of positions. For a message that needs context, consider mid-roll or a host-read; for a test, compare the same creative in different positions and use the measurement available. An evergreen sponsorship can use baked-in audio, while dynamic insertion can serve different advertisers as the back catalogue attracts downloads.

Podcast ad format comparison

Pre-roll

Placement: Before episode
Typical UK use: Awareness
Main risk: Thin attention

Mid-roll

Placement: Inside episode
Typical UK use: Direct response
Main risk: Higher rate

Host-read

Placement: Any position
Typical UK use: Trust-led
Main risk: Longer lead time

Post-roll

Placement: After episode
Typical UK use: Cheap reach
Main risk: Low completion

Data rules for targeting and capping

Choosing audience segments or limiting how often one listener hears your spot both involve processing personal data. The ICO guide to data protection for organisations sets out what needs to be in place before that processing begins.

Frequency capping raises the same questions as any other targeted advertising. The UK GDPR governs the lawful basis and the consent position, so ask the network to confirm both in writing. Our guide to frequency capping in podcast advertising covers how UK networks set and apply caps.

Common questions

Are pre-roll ads worth buying in the UK?

Yes, when the goal is broad awareness or a test of a concise script. It may be a poor fit if your message needs explanation, because listeners may not yet be settled when the spot plays.

How long should a mid-roll ad be?

Most UK networks work with 45 to 90 seconds for a mid-roll. Shorter reads suit a single offer, while longer reads need a story to hold attention.

Do host-read ads have to be labelled as advertising?

Yes. The CAP Code requires marketing communications to be identifiable, and the ASA handles complaints about whether ads meet that requirement. A clear spoken disclosure at the outset tells listeners that the host-read spot is advertising.

Can I buy pre-roll and mid-roll together in one deal?

Usually yes. Networks often bundle positions across a group of shows, so ask for a breakdown by position before you accept a blended rate.