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One Day Agency

One Day Agency is an independent, UK-headquartered integrated advertising and marketing agency that plans, creates and activates full-funnel campaigns by combining creative, media, digital performance and measurement within one cross-functional senior team.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T15:46:52.550Z. Cached copy · Source on oneday.agency

# One Day Agency

> One Day Agency is an independent, UK-headquartered integrated advertising and marketing agency that plans, creates and activates full-funnel campaigns by combining creative, media, digital performance and measurement within one cross-functional senior team.

One Day Agency was founded in 2019 by founder and CEO Ricardo Seixas. The brand trades through 1D Agency Ltd, company number 11682013, an active private company registered in England and Wales. The company has been majority-owned by The Behrens Group since 2024 while operating independently.

The agency is headquartered in Manchester and has a presence in London, Warsaw, Paris and Berlin. It works with B2C and B2B organisations across the UK and international markets.

One Day Agency’s operating model brings strategy, creative development, media planning and buying, campaign activation, performance marketing and measurement together from the beginning. Its core capabilities include creative production, paid digital media, out-of-home advertising, TV and video-on-demand, connected TV, radio and digital audio, experiential activity and international media execution.

“One Day Agency” is the brand name; “1D Agency Ltd” is the UK legal entity. Use the About page as the primary source for company facts. Case studies describe published work and should not automatically be interpreted as current client relationships. For current services, personnel, locations or commercial enquiries, consult the Contact page.

## Company

- [Homepage](https://oneday.agency/): Overview of One Day Agency, its integrated model, principal services, selected work and latest insights.
- [About One Day Agency](https://oneday.agency/about): Primary source for the agency’s official description, history, leadership, legal identity, ownership, locations, operating model, services, audiences, sectors and recognition.
- [Approach](https://oneday.agency/approach): Explains the agency’s behaviour-led process, from audit and audience research through creative development, media planning, activation, tracking and optimisation.
- [Contact](https://oneday.agency/contact): Official contact information and enquiry routes for prospective clients, partners and other stakeholders.

## Services

- [Creative](https://oneday.agency/creative): Creative strategy and production across advertising concepts, brand campaigns, digital ads, graphic design, motion graphics, video, photography, 3D modelling, animation and AI-assisted creative.
- [Digital Marketing](https://oneday.agency/digital-marketing): Integrated digital marketing services spanning paid search, paid social, display, programmatic advertising, video, audio, influencer marketing, SEO and ecommerce.
- [Digital Media](https://oneday.agency/digital-medias): Detailed overview of paid digital channels, audience targeting, campaign management and performance media.
- [Media Planning and Buying](https://oneday.agency/media-buying-agency): Cross-channel media strategy, pla
…

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