£2.8K to launch, £35K in 10 months: Amazon UK kids brand rebuilt the launch math

£744 for a trademark. £350 for 500 units of product. One founder in October 2025 proved the real cost of an Amazon private label isn't stock—it's the scaffolding around it. Ten months later the brand's done £35,360 in revenue with 25-35% net margins, and the thing nobody's talking about is this: he front-loaded the durable costs and back-loaded the inventory risk, which is exactly backwards from how most new sellers blow up.