The Independent Schools Council UK is providing resources for schools that want to set up a digital learning alternative should teaching be interrupted by the coronavirus.
Their initial advice is that the plan should work from where you currently are. For example, if everyone uses the school email system and that works consistently and reliably then that would be good enough to allow teachers to monitor student progress.
Beyond this, schools can consider website-based learning, apps or even streaming. The best solution will depend on how far along the digital path a school has already moved.