A realistic UK eCommerce launch timeline for an overseas brand is 8–16 weeks from decision to first sale — depending on product category, whether VAT registration is required before your first stock shipment and how quickly your marketplace accounts and platform integrations are set up. Rushing any stage — particularly VAT registration or customs clearance — can result in stock held at the border or marketplace accounts suspended before you make a single sale.
The key milestones and realistic timeframes are: UK EORI number application (3–5 working days); UK VAT registration (4–8 weeks via HMRC — apply as early as possible); freight booking and transit time from your manufacturer or warehouse (5–21 days depending on mode and origin); goods-in processing at your UK 3PL (1–3 working days after arrival); and marketplace or Shopify store setup (1–2 weeks if product content is ready). Amazon UK seller account verification can take 2–4 weeks for new accounts from certain countries, so start this process in parallel with VAT registration.
The critical path for most overseas brands is UK VAT registration. It must be completed before you can legally charge UK VAT to customers, and HMRC's processing times can extend to 8 weeks during peak periods. Apply as early as possible — ideally at the same time as you place your first manufacturing order. If stock is likely to arrive before your VAT number is issued, discuss the timing with your freight forwarder: there are mechanisms to defer import VAT accounting until registration is complete, but they must be arranged in advance of the goods arriving at the UK border.