CA24130 | Overseas leasing: Qualifying purpose: transport containers
From HM Revenue & Customs · Capital Allowances Manual
A transport container is used for a qualifying purpose if it is used in such a way that the basic rule CA24110 is satisfied. A transport container is also used for a qualifying purpose if it is leased by a UK resident who trades in the UK, and:
the container is leased by an operator of ships or aircraft who uses the container in the course of his ship or aircraft operations at other times, or
the container is leased under a succession of leases to different persons and, in general, those persons are not connected with each other.