Customs when leaving the UK
This page explains that some visitors to the UK can qualify for a refund of value added tax (VAT) paid on goods purchased during their stay.
To find out who qualifies for a refund and how to get it, see the guidance on VAT refunds for travellers departing from the European Community (EC)
on the website of HM Revenue & Customs.
If you want to claim a refund as you leave the UK, most ports and airports have signs directing travellers to customs. If not, you should ask airport or port staff to direct you to the Customs VAT Reclaim Office.
More information about finding customs on departure is on the website of HM Revenue & Customs.