To ask what the difference between essential, key and critical workers?

[Manteo]

I feel like people make a distinction but what I think if as keyworkers are all the roles that are listed under critical workers on the gov website. Essential workers I've no idea about!

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

Bump... anyone?