The Pilgrims of Great Britain and its sister society, the Pilgrims of the United States, are the two oldest and most prestigious Anglo-American organisations on both sides of the Atlantic. Over more than a century the Pilgrims have played a very important role in cementing good relations between the two countries, and have acted as one of the principal custodians of what has come to be known as the Special Relationship.
https://www.pilgrimsociety.org/
The Not So Special Relationship
How Trump Has Bewildered the United Kingdom
https://www.foreignaffairs.com/articles/europe/2019-10-09/not-so-special-relationship