VPDS158000 | Vaping Products Duty and Vaping Duty Stamps: Duty stamps: Exceptions for requirement to stamp
From HM Revenue & Customs · Vaping Products Duty and Vaping Duty Stamps guidance
Duty stamps do not need to be affixed to packaging in the following circumstances:
where they are to be exported from the UK after manufacture
where they are to be shipped/carried for use onboard a ship, aircraft or train as stores
for use in an export shop
brought into the UK as a part of a passangers personal "duty free" allowance
where another relief has been afforded