At some point in it’s history, Britain has invaded about 90% of the countries of the world. While most of these states were not a part of the British Empire, all the countries in red sustained some kind of British military presence or government sanctioned incursion. The list of 22 non-invaded countries, which includes São Tomé and Príncipe (though not pictured on the map), was put together by Stuart Laycock in his 2012 book, All the Countries We’ve Ever Invaded: And the Few We Never Got Round To.
The Decolonial Atlas 