Yesterday, as I will write about a bit later, Google launched the Jazz interface to everyone. Part of that is a new Google logo but today, Google went back to the old logo on Google UK. On Google UK, Google has a logo for the 2010 elections and the logo is the old Google style.
Here is a picture:
In any event, a Google Blogoscoped Forums thread has a comment from Roger Browne that this door in the logo looks a lot like 10 Downing Street, which is the Prime Minister's Office.
Forum discussion at Google Blogoscoped Forums.