For exports by air, the manifest must be presented to Customs when applying for outward clearance of the aircraft.

Whether or not your vessel requires customs outward clearance prior to departure, there is still an obligation on masters to comply with safety conventions adopted as international standards.

C3-9: Outward clearance of commercial vessels This book is written for the guidance of staff dealing with commercial vessels in UK ports, sailing from the UK to destinations within the European Union (EU) and to countries outside the EU.