NSPCC Learning (which is primarily aimed at people who work with children) has updated “How to have difficult conversations with children” content to include references to Coronavirus: https://learning.nspcc.org.uk/safeguarding-child-protection/how-to-have-difficult-conversations-with-children/
One of the things highlighted in this content is Childline’s new page on the virus, which has lots of helpful information for children: https://www.childline.org.uk/info-advice/your-feelings/anxiety-stress-panic/worries-about-the-world/coronavirus/
There is also a page on the main NSPCC website (which is aimed principally at parents) around talking about difficult topics. It doesn’t reference Coronavirus specifically (yet), but still has lots of helpful advice: https://www.nspcc.org.uk/keeping-children-safe/support-for-parents/talking-about-difficult-topics/
You might also be interested in the news story we’ve published on NSPCC Learning about undertaking remote teaching safely. I imagine you may be getting some enquiries about that too: https://learning.nspcc.org.uk/news/2020/march/undertaking-remote-teaching-safely/
If you haven’t already, I would also recommend signing up to CASPAR, which provides a weekly update of all the new content we are putting out, as well as flagging useful resources from other organisations: https://learning.nspcc.org.uk/newsletter/caspar/