Announcing the 2027 TCS London Marathon Double: Two Days. One Event. 100,000 People

The TCS London Marathon has announced that its 2027 edition will expand into a two-day event, marking a one-time-only format change. The expanded event is expected to accommodate 100,000 participants across the two days, doubling the typical single-day capacity. The initiative, dubbed the 'TCS London Marathon Double,' represents a historic milestone for the world-famous annual race.