Retrieved from <a href="https://www.ons.gov.uk/surveys/informationforbusinesses/businesssurveys/annualsurveyofinternationaltradeinservices" target="_blank">https://www.ons.gov.uk/surveys/informationforbusinesses/businesssurveys/annualsurveyofinternationaltradeinservices</a> (ITIS) and various administrative data sources, including the HM Revenue & Customs (HMRC) produced Overseas Trade Statistics.4HM Revenue & Customs.