Here's a poster of the Big Ben Clock Tower - one of a set of posters featuring London landmarks. If you can't make it to the city yourself why not display them around the room and do your own spotters walk?
Big Ben Poster
Here is a poster of a Beefeater, or Yeoman Warder as they are formally known, for you to print and display.
Here's a poster of Buckingham Palace, the official London residence of Queen Elizabeth II, for you to print and display.