marshall led a tube-based charity event in 2005 with "tube relief". it was in response to the 7 july 2005 london bombings. around 50 people took part, raising over £11,000 for charity. marshall later did a series of "walk the tube" events to raise money for charities, by getting a group of people to visit every tube station but not as a record attempt. these events took place for three years following 2013.