The Cheapest Ad in Britain Is Sellotaped to a Window

Somewhere in Britain right now, a greengrocer is writing 'STRAWBS £2 A PUNNET' on the back of a cereal box, slapping it against the glass, and outperforming half the paid campaigns running on Meta.

No targeting. No A/B testing. No boosted posts. Just a biro, some cardboard, and an understanding of one thing most digital marketers have forgotten: the person walking past your shop is the warmest lead you'll ever get.

Why the Window Beats the Feed

Paid social asks a stranger to care. A window sign asks someone already standing twelve feet from your door to make a decision. That's not a fair fight.

Think about the journey. Someone's walking to the station, peckish, not thinking about food. Then they see 'HOT PIES — FRESH OUT THE OVEN' in wobbly handwriting and their brain does the rest. No algorithm could time an ad that precisely, because the algorithm doesn't know it's raining, it's 4:45pm, and the person is passing your door right now.

Footfall businesses — chippies, bakers, greengrocers, post offices, hardware shops — run on this stuff. A survey sign isn't marketing in the abstract. It's the last word in a conversation happening at street level.

What the Greats Get Right

Every high street has its window-sign champions once you start looking:

• The chippy that writes 'COD & CHIPS £6.50 — TODAY ONLY' on an A4 sheet. Scarcity, price, product. Three lines, done.
• The greengrocer whose signs name the farm. 'Asparagus from the Vale of Evesham' sells better than any stock photo ever could.
• The post office with a simple 'CASH MACHINE WORKING' sign — proof that the best copy sometimes just solves a problem.

Notice what they have in common: specificity and honesty. Nobody handwrites 'synergistic culinary solutions.' They write 'SOLD OUT OF SCRANS, BACK TOMORROW.'

Five Rules for a Sign That Sells

If your window currently says nothing, here's your starter kit:

1. Lead with the offer, not the business name. Nobody needs 'SMITH & SON EST. 1987' in big letters. They need 'TODAY: SAUSAGE ROLLS 2 FOR £1.'

2. Use a number. Prices, quantities, times. 'FRESH BREAD AT 8AM' beats 'fresh bread available.'

3. Create a reason to act now. 'While they last', 'today only', 'before the school run'. Handwriting makes it feel temporary — lean into that.

4. Big enough to read from across the road. Test it. Cross the street. If you're squinting, start again. Lowercase block capitals, thick marker, one message per sheet.

5. Change it regularly. A sign that's been sun-faded for six months signals nobody's paying attention. Fresh cardboard equals a shop that's switched on.

Paper, Pint and Placement

Small details matter. A sheet of white card from any stationer costs pennies and reads better than lined paper torn from a notepad. If you're doing this weekly, a £5 pack of A3 card and a chunky black marker will last you a season.

Placement: eye level for someone walking, not someone standing. Angle the sign slightly outwards so it catches the gaze of people approaching, not just passing. And keep the glass behind it clean — a great sign in a filthy window is a mixed message.

One more trick: keep a couple of blank signs ready. When the weather turns, 'HOT SOUP — IN FROM THE RAIN' can go up in ninety seconds. Digital campaigns need a week of approvals. Cardboard needs a marker pen.

The Real Lesson

None of this means ditch digital. It means remembering what marketing is for: getting the right message in front of the right person at the right moment. Sometimes that's a retargeting ad. More often than you'd think, it's a bit of card, a marker, and a shop window on a rainy Tuesday in Wigan.

Total spend: under a pound. Which, funnily enough, is right in our price range.