Yesterday, the Government released new guidance on quarantining and Employment Rights for England:

https://www.gov.uk/guidance/self-isolating-after-returning-to-the-uk-your-employment-rights

The other home nations have their own guidance:

Wales: https://gov.wales/how-self-isolate-when-you-travel-wales-coronavirus-covid-19

Scotland: https://www.gov.scot/publications/coronavirus-covid-19-public-health-checks-at-borders/pages/self-isolation/ (updated August 24th)

Northern Ireland: https://www.nidirect.gov.uk/articles/coronavirus-covid-19-travel-advice

Broadly they all require 14 days of quarantine if coming back from a country not on the approved list. Work can undertaken from home during that time. Given how quickly that list and rules can change, Scotland reviews its regulations everyone 21 days, FAME members are advised to check with their staff leaving the country for work or  holiday and plan for them to do home work for two weeks after they return, even if the country they are visiting is currently on the approved list as that is subject to change at short notice.