Apple recently pulled its end-to-end encryption service, Advanced Data Protection (ADP) from UK devices following an alleged request from the British government to build a backdoor into the encryption, which would allow access for law enforcement agencies.

A London court hearing, reported to be Apple's appeal against a British government order to create a "back door" to its encrypted cloud storage systems, was held in secret on Friday, with media not allowed to attend despite a formal request.

Apple's appeal against a UK government demand to be able to access its customers' most highly encrypted data is set to be considered at a secret hearing at the High Court on Friday, the BBC understands.