Stock & Fable
Case study · Paid advertising

Paid media where every pound is watched

We worked on paid advertising with Trainline, the rail booking platform. Paid search and paid social at serious scale, inside a large in house marketing organisation where budgets are scrutinised and every test has to justify itself. It is a very good place to learn discipline.

2
core channels: paid search and paid social
50+
creative variants tested across campaigns
12
audience segments managed and reported on

The organisation

Trainline is one of the biggest names in rail booking, with millions of customers and a marketing operation to match. At that size, paid advertising stops being about individual ads and becomes a system: structured accounts, constant testing, and reporting that people actually make decisions from.

Working inside a large in house team is its own skill. There are channel specialists, analysts, brand guardians and product teams, and your work has to fit alongside all of them. Nothing ships on a whim, and that is a feature, not a bug.

How we approached it

Performance at scale is not about clever tricks. It is a weekly rhythm, run without exceptions.

  1. Structure before spend. Clean account architecture and tracking first, because you cannot optimise what you cannot measure honestly.
  2. Test with a method. Clear hypotheses, clean comparisons, decisions made on the numbers rather than on taste. Fifty-plus creative variants earn their keep or get switched off.
  3. Move budget to what earns it. Audiences and placements reviewed on a schedule, with spend following performance rather than habit.
  4. Report for decisions. Every report answered three questions: what happened, why, and what we would do next.

"Either the numbers moved or they did not. Scale forces honesty."

The habit we brought home from working at this size

What we delivered

Paid search managementLarge scale Google Ads accounts kept healthy and improving
Paid social managementMeta campaigns across acquisition and retention audiences
Creative testingHypothesis-led variant testing with clean readouts
Audience managementTwelve segments managed, budgeted and reported on
Budget managementSpend moved on a schedule towards what performed
Stakeholder reportingReporting analysts, brand and product teams could act on

What it taught us

Scale forces honesty. When budgets are large and results are visible to everyone, you cannot hide behind vanity metrics or a nicely designed report. That habit of judging work by outcomes, not effort, is one we have kept.

It also taught us that most paid media wins are boring. Tighter account structure, cleaner tracking, one clear message per ad, budgets reviewed on a schedule rather than a whim. Small businesses often think big companies have secret tactics. They mostly have discipline, and discipline is portable.

What this means for your business

Your budget is not Trainline's budget, which is exactly why it deserves the same discipline. Waste hides easily in small accounts because nobody is looking. We bring the big-account habits to SME budgets: honest tracking, structured testing and spend that follows results. Your ad accounts stay in your name, your budget goes straight to the platforms, and the reporting tells you the truth. That is the whole offer.

Drawn from work with this organisation. Some details are generalised for confidentiality.

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