The government has published its plan for the UK leaving the EU. Read the Prime Minister's letter.
List of tax type codes to be entered into box 47(a) of a customs declaration.
This guidance is part of volume 3.
You can find specific commodity codes in the UK Trade Tariff.
1 January 2009
HM Revenue & Customs
UK Trade Tariff: volume 3
International freight industry and businesses making customs declarations
Don’t include personal or financial information like your National Insurance number or credit card details.