BKM406350 | Banking surcharge: targeted anti-avoidance rule: meaning of relevant transfer – CFC chargeable profits
From HM Revenue & Customs · Banking Manual
There is a relevant transfer if there is, in substance:
a transfer (directly or indirectly) of all or a significant part of the chargeable profits of the CFC to a non-banking company, or
a transfer (directly or indirectly) of a loss or deductible amount to the CFC from a non-banking company, resulting in the elimination or significant reduction in the surcharge profits.