The Family Court has issued recent guidance on the use of electronic bundles at https://www.judiciary.uk/announcements/financial-remedies-courts-e-bundles-protocol/
This is intended for financial remedies hearings but is useful guidance for anyone planning on working paperlessly or part paperlessly.
Most usefully, it considers the perfectly reasonable situation where counsel and the judge may work paperlessly but there is still an (identical!) paper copy for witness use.
It would be a great leap forward to promote this in the civil courts more generally especially for those who prefer to work electronically – especially for GDPR reasons – remembering that an encrypted device loss is a breach but one which is unlikely to require reporting.