Flat sales after launch can mean a slow burn or a stalled Amazon launch. How VendLab tells them apart, the five checkpoints for the first 90 days and what to fix before Black Friday.

Breakeven ACOS is the ceiling your Amazon advertising has to stay under. How to build it from UK referral fees, FBA fees, storage and VAT, and why it drops in Q4.

Amazon Q4 storage fees take standard-size FBA storage from 76p to £1.51 per cubic foot from 1 October. What the peak rate, aged inventory surcharge and £7.80 overage fee cost, and how to trim the bill before the October invoice.

Two threshold figures get quoted to UK sellers planning Pan-EU FBA: £90,000 and €10,000. Once stock sits in the EU, neither decides whether you must register. Here is what each one actually covers, sourced to GOV.UK, HMRC, the European Commission and Amazon.

Six dates decide Q4 on Amazon UK in 2026. Four of them are Amazon’s deadlines. Here is what each one triggers, what it costs to miss, and what to do this week.

Most Amazon ad accounts are carrying a hidden problem: a healthy ACOS hiding a chunk of spend that never converts. Here is the five-check audit VendLab runs on every new account, and what it usually finds.