Saturday 7 July London: 8km prologue, passing by Big Ben, The Houses of Parliament, Buckingham Palace and Hyde Park.
Tour de France London - See the Prologue course:
Sunday 8 July London-Greenwich-Canterbury: 203km.
Tour de France London - See the Stage 1 course:
The LeTour.com site also has a page on Le Tour's relationship with Great Britain. It's a bit sparse as the race has only landed on these shores three times in its history, but mention is also made of the biggest British TDF participants.