END USER LICENCE AGREEMENT

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• ATA : (International) Air Transport Association 
• DBC : Declaration By Conduct
• EIDR : Entry In the Declarant's Records 
• EORI: Economic Operators Registration and Identification
• GMR :  Goods Movement Reference  
• GVMS : Goods Vehicle Movement Service
• GMR: Goods Movement Reference
• CTC: Common Transit Convention
• LRN: Local Reference Number
• MRN: Movement Reference Number
• HMRC :  HM Revenue & Customs
• SAD : Single Administrative Document
• TIR : Transports Internationaux Routiers, (International Road Transport)
• Customs I/E : Customs declaration imports or exports 
•  NCTS: New Computerised Transit System 
• NI Protocol: Political agreement made after GB exit from EU.

Full explanation of these terms can be found through .gov.uk and other agencies websites.