Very helpful resource, fenchie! Thank you for sharing!!! 
https://www.google.com/amp/s/www.independent.co.uk/travel/news-and-advice/travel-holiday-uk-testing-covid-b1827829.html?amp
This article is also quite informative for UK travellers. Sounds like we may be able to use our own lateral flow tests for our return
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hi Augie, the ferries will ask for another health-form, I have read. can I download it somewhere to fill out beforehand and does every passenger have to fill out his own or do all car-passengers go on one?
not necessary to answer that question, I found the answer on www.greece-ferries.com
Hey Hobgoblin! 
I spoke with the 2 main ferry companies of Thassos and here’s what they said:
ANETH (https://www.anethferries.gr/index.php/en/)
At the moment, they are not requiring foreign travelers to complete a form since they have already completed the PLF form and have already met all the conditions for entering the country and traveling through Greece. The form ANETH has for passengers is only in Greek, for domestic travelers.
Thassos Ferries (http://thassos-ferries.gr/en/index.php)
They provide a form to passengers at the ticket stand. Their forms are not available online at this time.
Generally, when required, every adult passenger needs to fill out a form.