Two groups of marines set off from Downing Street this morning, on an epic fund raising speed march around the capital.
One team headed east to the Olympic Park, and the other set off west, past Buckingham Palace.
They were seen off by Prime Minister David Cameron and the Military Wives choir.
More top news
Hundreds of people do no know when they will be allowed back home after a 'serious incident' was declared in east London.
A Tube and rail strike planned for Wednesday evening could bring the capital to a standstill causing travel chaos for millions of commuters
The only Muslim survivor of the 7/7 terror attack in London has urged the country to stand together against Islamophobia.