Question: Who will have to self-isolate when they travel to the UK?

Answer passage (source: UK):
page_title: Guidance Waiting to return to the UK during coronavirus (COVID-19)
section_headers: Checklist if you are waiting to return to the UK
section_content: If you cannot currently return to the UK:

follow the advice of local authorities, including local measures to help minimise your risk of exposure to coronavirus
find accommodation that is suitable for your needs
check your visa, if you have one for the country you’re in. If it is due to expire, visit our travel advice and read the ‘staying during coronavirus’ section. The Foreign & Commonwealth Office has negotiated with local authorities in some countries to automatically extend visas if you cannot return
contact your travel insurance provider to check your health cover. Most providers will look to extend single trip cover for up to 60 days if you are making every effort to return home
read our travel advice of the country you’re in, in particular the ‘staying during coronavirus’ and ‘return to UK’ sections
sign up to email alerts for the country where you are, so you are notified of any updates

If you need urgent consular help, contact your nearest British embassy, high
commission or consulate.

Reviewer feedback on this answer:
This answer gives information so that people can call and get more sources for this answer. This does not give a direct answer but links and suggestions on where to get this information
This answer relates to those who are unable to return to the UK, and not to those who need to self isolate.

Reviewer ratings:
Could be Improved
Bad

Answer passage (source: UK):
page_title: Guidance Coronavirus outbreak FAQs: what you can and can't do
section_headers: Borders / international visitors
What is self-isolation and which countries will it apply to?
section_content: Please note - these measures are NOT yet in force. We will set out further
detail, including from when these will be in force, in due course.
We will be asking people travelling to the UK to make some sacrifices to stop
coronavirus cases from being imported. In the same way as people in the UK
have made large sacrifices to control the spread of coronavirus.
So what we will be asking people to do on entering the UK is supply their
contact details and details of their accommodation, and to self-isolate in
their accommodation for 14 days, other than those on a short list of
exemptions.
We will set out further details shortly.

Reviewer feedback on this answer:
This answer does not address who should be self isolating, and thus not related to the question.
This answer only suggest that people self isolate when they go to UK. There is no official guidelines on what to do yet.

Reviewer ratings:
Bad
Could be Improved

Answer passage (source: UK):
page_title: Entering the UK
section_headers: Who does not need to provide their details or self-isolate for 14 days
section_content: You will not need to fill in the form or self-isolate for 14 days if you’re
travelling to the UK from:

Ireland
the Channel Islands
the Isle of Man

There are other reasons why you might not need to fill in the form or self-
isolate. Read the list of who does not need to fill in the form or self-
isolate.
The rules about who does not need to fill in the form or self-isolate will
remain under review and may change in the future. You’ll be able to find more
information on this page when it’s available.

Reviewer feedback on this answer:
This answer does not relate to whether who will need to self-isolate when they travel to the UK.
This has a more definite answer to who has to isolate. There are currently three places that is required for self isolation but this so gives a link for additional info

Reviewer ratings:
Bad
Acceptable