I want to know the answer to the following question:
Where did the torch relay begin in London for the 2008 Olympics?
All the background I'm provided with is that "A Metropolitan police briefing paper revealed that security for the torch relay cost £750,000 and the participation of the Chinese security team had been agreed in advance, despite the Mayor stating, "We did not know beforehand these thugs were from the security services.". Is that enough to answer the question?