ELSA-Support has free emotional literacy resources, including stories to help you explain what is going on to you children https://www.elsa-support.co.uk/category/free-resources/

Unicef has 8 Tips to Help Comfort and Protect Children to support open discussions with children about coronavirus.

YoungMinds has good advice about talking to children about coronavirus https://youngminds.org.uk/blog/talking-to-your-child-about-coronavirus/