The UK has reciprocal maintenance arrangements with more than 100 countries and territories worldwide. This is the full list:
Algeria
Anguilla
Antigua
Austria
Australia
Bahamas
Barbados
Belize
Belgium
Bermuda
Bosnia & Herzegovina
Botswana
Brazil
British Solomon Islands
Brunei
Burkina Faso
Canada (except Quebec)
Cape Verde
Cayman Islands
Central African Republic
Chile
Croatia
Czech Republic
Cyprus
Denmark
Dominica
Ecuador
Estonia
Falkland Islands
Fiji
Finland
France
Gambia
Germany
Ghana
Gibraltar
Greece
Grenada
Guatemala
Guyana
Guernsey
Haiti
Hong Kong Special Administrative Region of the People's Republic of China
Hungary
Iceland
India
Ireland
Isle of Man
Israel
Italy
Jamaica
Jersey
Kenya
Kiribati
Lesotho
Luxembourg
Former Yugoslav Republic of Macedonia
Malawi
Malaysia
Malta
Mauritius
Mexico
Monaco
Montserrat
Morocco
Nauru
Netherlands
New Zealand
Niger
Nigeria
Norfolk Island
Norway
Pakistan
Papua New Guinea
Philippines
Poland
Portugal
Romania
St Helena
St Kitts & Nevis
St Lucia
St Vincent
Serbia & Montenegro
Seychelles
Sierra Leone
Singapore
Slovakia
South Africa
Spain
Sri Lanka
Surinam
Swaziland
Sweden
Switzerland
Tanzania
Trinidad & Tobago
Tunisia
Turkey
Turks & Caicos Islands
Tuvalu
Uganda
United States (except Alabama, Mississippi, South Carolina, and the District
of Columbia)
Uruguay
Vatican (Holy See)
Virgin Islands
Zambia
Zimbabwe