This part of GOV.UK is being rebuilt – find out what beta means

HMRC internal manual

Diplomatic Privileges Manual

Appendices: Glossary

diplomatic bags This can consist of crates and/or containers but must be supported with documentation detailing the weight and dimensions of the cargo. 
concession vehicle Any mechanically propelled vehicle imported, acquired or purchased in the UK under diplomatic relief.Does not include- boats or planes. 
continuing privileges The duty and VAT free privileges available to entitled diplomats throughout the duration of their appointment. 
EU The European Union  The member states currently are:Austria; Belgium; Bulgaria; Cyprus; Czech Republic; Denmark; Estonia; Finland; France; Germany;Greece; Hungary; Ireland; Italy; Latvia;Lithuania; Luxembourg; Malta; Netherlands; Poland;Portugal; Romania; Slovakia; Slovenia; Spain;Sweden; United Kingdom The application of the Community Customs Code and VAT Directive shall be suspended in those areas of Cyprus in which the Government of the Republic of Cyprus does not exercise effective control. Goods from those areas continue to be treated as non-EU imports. 
EFTA - European Free Trade Agreements  EFTA countries - Iceland, Liechtenstein, Norway and Switzerland.
FCO   Foreign and Commonwealth Office
first arrival privileges The duty and VAT free privileges that may be available to the diplomats within the first six months from the date of taking up their appointment in the UK. 
HMRC Helpline   VAT, Excise and Customs helpline number is 0845 010 9000
inviolability Diplomatic bags, provided clearly marked as such cannot be opened or detained. 
mission Any foreign embassy, commonwealth high commission, consular post or international organisation. 
New Means of Transport  As per the definitions in VATNMT and Notice 728.
premises of the mission Any building, part of building or adjoining land recognised as for use by the mission. 
UK Tariff The Tariff is a three volume annual publication which is updated monthly containing useful information about customs import and export requirements.Volume 1 contains essential background information for importers and exporters, contact addresses for organisations such as Department for Business, Innovation and Skills, Department of Environment, Food and Rural Affairs and Forestry Commission. It also contains an explanation of Excise duty, Tariff Quotas and many similar topics. Volume 2 contains the 16,000 or so Commodity Codes set out on a Chapter by Chapter basis. It lists duty rates and other directions such as import licensing and preferential duty rates. Volume 3 contains a box-by-box completion guide for C88 (SAD) entries, the complete list of Customs Procedure Codes (CPCs), Country / Currency Codes, lists of UK ports and airports both alphabetically and by their legacy Entry Processing Unit (EPU) numbers, and further general information about importing or exporting. The Tariff is available on an annual subscription and is also available at some larger libraries. You can buy the Tariff in printed and CD ROM formats or subscribe to the new e-service from the Stationary Service.