The Sinopean Club is a gentlemen's club for Disraeli, Gladstone and the Earl of Cardigan. Jacob infiltrates it in Playing Politics to learn who "B" is, and in Family Politics Evie drives Gladstone there in a stolen royal carriage.
Jacob overhears Disraeli and Gladstone arguing over the Corrupt Practices Act, then spots a spy following Disraeli as he leaves.
Evie and Duleep Singh pose as an official carriage to pick up Gladstone on his way to the club, but Duleep fails to win him over.
In a scene from Starrick's side of A Bad Penny, the Grand Master rebukes the Earl of Cardigan for lounging in the club instead of guarding Templar interests in Parliament, and threatens him with a knife.
Jacob tackles the spy, Herbert, thinking he has caught B, only to learn the man was simply paid to tail the Prime Minister.
Belgrave Square
Belgrave Square is one of London's largest 19th-century garden squares. In Syndicate it is the first stop in the main memory Family Politics, where Evie picks up a politician for Duleep Singh.
Buckingham Palace
Buckingham Palace is Queen Victoria's London home in Westminster and the setting for the climax of Syndicate's story, the Queen's ball. It is also where the Queen hands out the Operation side memories, and it has a viewpoint.
Buckingham Palace vault
The Buckingham Palace vault is a hidden crypt under the palace gardens that holds the Shroud of Eden, the Piece of Eden both the Assassins and Starrick are chasing in Syndicate. You finally reach it during A Night to Remember.
Palace of Westminster
The Palace of Westminster, home of Parliament, is in Westminster beside the Clock Tower. It has a viewpoint, Jacob assassinates the Earl of Cardigan here in Motion to Impeach, and the twins later stop a Templar bomb plot inside.