Refills, delivered — and whether one postcode carries it.

Before you build it, four documents about it: who else is already selling to someone with a cargo bike and one neighbourhood in mind, one price you can defend, a money model with every guess labelled, and where the first customers are.

What it checks first, for this one.

1. Who already delivers groceries in that postcode and whether refills are a line on their van already
2. What the wholesale price of the three highest-volume products is, since the margin is set upstream
3. Whether the council or the landlord has anything to say about a collection point

How many drops per hour does the round need before the bike pays for the hour?