On 20 March 2019, the Swiss Federal Customs Administration (FCA) issued the following Information:
Agreement on Customs Facilitation and Security: Bilateral traffic between Switzerland and United Kingdom of Great Britain and Northern Ireland
It is currently unclear what status the United Kingdom of Great Britain and Northern Ireland (UK) will have following its withdrawal from the European Union (EU) on 29 March 2019. If there is a disorderly withdrawal, additional security data must be entered in the customs declaration for goods traffic between Switzerland and the UK.
Relations between Switzerland and the UK are currently largely based on bilateral agreements with the EU which will no longer be applicable to the UK after withdrawal from the EU (or after the end of a transitional phase).
Should the UK’s departure be disorderly (no deal or hard Brexit), the bilateral trade agreement between Switzerland and the UK will be applied provisionally from the date of departure1 . Goods traffic between Switzerland and the UK will be subject to prior notification.
Further information: More security for the supply chain2
Should the EU and the UK agree on a withdrawal agreement within this period, the Customs Facilitation and Security Agreement between Switzerland and the EU would continue to apply in the relationship between Switzerland and the UK during a transitional phase until at least 31 December 2020.