Walk the Walk, the charity behind the event, has raised more than £27m for breast cancer research and cancer care to date.
- About 15,000 women and men wear decorated bras to power-walk the London Marathon course at night.
- Walk the Walk's goal this year is to break the £35m mark.
- Celebrities taking part include Kirstie Allsopp, Lisa Faulkner, Charlie Dimmock, Amanda Burton and Kate Garraway.
- Sponsors include The Daily Telegraph, New Balance, Ford, Frusli and Avon.