Please see the links below for new and updated government guidance 

Main guidance:

https://www.gov.uk/guidance/national-lockdown-stay-at-home

Updated critical worker list:

https://www.gov.uk/government/publications/coronavirus-covid-19-maintaining-educational-provision/guidance-for-schools-colleges-and-local-authorities-on-maintaining-educational-provision

Advice to parents on making a childcare bubble

https://www.gov.uk/guidance/making-a-childcare-bubble-with-another-household