Originally Posted by
SonTech
ETD's are only intended to get you home, not travel to other countries unless that is the only way home.
https://www.gov.uk/emergency-travel-document
"You can use an emergency travel document to travel to your destination through a maximum of 5 countries. You can also normally use it to return to the country you’re applying from if you live there.Your travel plans (countries and dates) will be printed on your emergency travel document. If you change your travel plans once you have your emergency travel document, you’ll need to apply for a new one."
So they can certainly allow someone to finish a trip as long as the countries are listed on the ETD