Passengers from non-European Union countries who have used a UK retailer participating in the VAT Retail Export Scheme, who are going to a final destination outside the EC, should post the refund document in the HM Customs & Excise post box situated in the departure lounge (immediately after processing security). Customs officials will collect it and if all requirements have been met, they will contact the retailer to arrange the VAT refund. For more information please see HMRC’s pages on tax on shopping and services