Covid-19 links for when traveling to or from the Netherlands:
EJSU COVID Travel Advice – https://www.ejsu.net/covid-19/travel/
Re Open Europe (EU Website with COVID advice for EU countries only (not UK)) – https://reopen.europa.eu/en
UK Foreign Travel Advice (by country) – https://www.gov.uk/foreign-travel-advice
UK Government (Travel to England) – https://www.gov.uk/guidance/travel-to-england-from-another-country-during-coronavirus-covid-19
UK Government (Travel to Scotland) – https://www.gov.scot/publications/coronavirus-covid-19-international-travel-quarantine/
UK Government (Travel to Wales) – https://gov.wales/rules-international-travel-and-wales-coronavirus
UK Government (Travel to NI) – https://www.nidirect.gov.uk/articles/coronavirus-covid-19-travel-advice
Netherlands Government – https://www.government.nl/topics/coronavirus-covid-19/visiting-the-netherlands-from-abroad
German Government – https://www.auswaertiges-amt.de/en/coronavirus/2317268
Belgian Government – https://diplomatie.belgium.be/en/services/travel_to_belgium and https://visit.brussels/en/article/coronavirus-info-state-of-play-brussels
French Government – https://www.diplomatie.gouv.fr/en/coming-to-france/coronavirus-advice-for-foreign-nationals-in-france/