It is envisaged that, for captive firms, the information provided to the CBB through the Insurance Firm Return and periodic notification of changes of controller etc. will be adequate for their supervisory purposes, other than in exceptional circumstances. Captive insurance firms are reminded, however, that they are required to maintain an open relationship with the supervisor and that the CBB does have powers to visit the premises of firms or insurance managers (other than in exceptional circumstances, with reasonable notice), request information and commission a report on the firm's business.