St. James Park (Brick Lane)

St James's Park is a 57 acre park in the City of Westminster. It is part of a continuous chain of parks that is near Buckingham Palace, which is to the west of St James's Park. It also has a small little lake in the center of it, containing two islands. It originally was closed to the public, at one point being grazing ground for cattle. A couple centuries later, the ground was opened to the public when the Buckingham House was expanded to create the palace. (wiki)

"They walked on the other side of the road, following St. James Park, back towards Buckingham Palace." (Brick Lane, Monica Ali) Showing that the park acts as a guide toward the palace. It essentially leads up to the front door of Buckingham Palace.