Although England and the UK claim they are liberalising travel and holidays for their inhabitants and visitors, the Green List (countries which the British may visit without restrictions) is steadily shrinking as the Amber and Red Lists grow. 

The Amber List means travel is discouraged by government, 72-hour PCR test before departure, two more tests after arrival and 10-day self-isolation on arrival in UK. The Red List denotes that travel is strongly discouraged by government, only British and Irish nationals and residents are allowed in from these countries (no tourists),72-hour PCR test and 10 days pre-booked managed quarantine.

On June 3, the UK government updated its lists on gov.uk. Portugal was designated for removal from the Green List to Amber on June 8. Also, on that date, Afghanistan, Bahrain, Costa Rica, Egypt, Sri Lanka, Sudan, and Trinidad and Tobago will move from Amber to Red list.

From June 8, the Red List comprises:

Afghanistan

Angola                   

Argentina               

Bahrain                 

Bangladesh            

Bolivia          

Botswana               

Brazil           

Burundi                  

Cape Verde           

Chile            

Colombia               

Congo (Democratic Republic)                

Costa Rica            

Ecuador                 

Egypt          

Eswatini                 

Ethiopia                 

French Guiana                 

Guyana                 

India            

Kenya          

Lesotho                 

Malawi                   

Maldives                

Mozambique          

Namibia                 

Nepal           

Oman          

Pakistan                

Panama                 

Paraguay               

Peru            

Philippines             

Qatar           

Rwanda                 

Seychelles             

Somalia                 

South Africa           

Sri Lanka    

Sudan

Suriname               

Tanzania                

Trinidad and Tobago

Turkey                   

United Arab Emirates (UAE)                 

Uruguay                 

Venezuela              

Zambia                  

Zimbabwe

Source: https://www.tourismupdate.co.za/article/uks-green-list-shrinks-red-and-amber-grows