Guidance on bubbles in early years settings (England) is changing from 20 July. Settings won’t have to keep children in bubbles but should still minimise mixing of children where possible: 

“From 20 July, early years settings will no longer be required to keep children in small, consistent groups within settings. Settings should still consider how they can minimise mixing within settings, for example where they use different rooms for different age groups, keeping those groups apart as much as possible.”