The government has published its plan for the UK leaving the EU. Read the Prime Minister's letter.
This customs information paper explains the changes in banking supplier.
For overseas customers there is a new Bank Identifier Code (BIC) and International Bank Account Number (IBAN) that will need to be entered during the payment process.
8 April 2016
HM Revenue & Customs
Customs information papers
International freight industry and businesses making customs declarations
Don’t include personal or financial information like your National Insurance number or credit card details.