Hague Apostille Convention, embassy legalisation is not required for documents in signatory countries. In the UK, you can get documents legalised by obtaining an apostille from the Foreign, Commonwealth & Development Office (FCDO), which is all that’s needed for use in other Hague Convention countries.
Albania
Andorra
Antigua and Barbuda
Argentina
Armenia
Australia
Austria
Azerbaijan
Bahamas
Bahrain
Barbados
Belarus
Belgium
Belize
Bolivia
Bosnia and Herzegovina
Botswana
Brazil
Brunei
Bulgaria
Burundi
Cabo Verde
Chile
Hong Kong (China)
Macao SAR (China)
Colombia
Cook Islands
Costa Rica
Croatia
Cyprus
Czech Republic
China
Denmark
Dominica
Dominican Republic
Ecuador
El Salvador
Estonia
Fiji
Finland
France
Georgia
Germany
Greece
Grenada
Guatemala
Guyana
Honduras
Hungary
Iceland
India
Indonesia
Ireland
Israel
Italy
Jamaica
Japan
Kazakhstan
Korea
Kosovo
Kyrgyzstan
Latvia
Lesotho
Liberia
Liechtenstein
Lithuania
Luxembourg
Malawi
Malta
Marshall Islands
Mauritius
Mexico
Moldova
Monaco
Mongolia
Montenegro
Morocco
Namibia
Netherlands
New Zealand
Nicaragua
Niue
North Macedonia
Norway
Oman
Palau
Panama
Paraguay
Peru
Philippines
Poland
Portugal
Romania
Russian Federation
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
Saudi Arabia
Samoa
San Marino
Sao Tome and Principe
Serbia
Seychelles
Singapore
Slovakia
Slovenia
South Africa
Sweden
Switzerland
Tajikistan
Tonga
Trinidad and Tobago
Tunisia
Turkey
Ukraine
United Kingdom of Great Britain and Northern Ireland