The crowd was also played a video message from former England captain David Beckham.
After the Government committed to giving an extra £375 million to help feed the world's poorest children, Beckham said:
We've had good news. Earlier today the Prime Minister met with other world leaders and has made a real commitment to ending child malnutrition and hunger. There is more to do though and you can help.
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Martin Gallagher was in Euston station when he saw Grace Georgina crying - she had lost her ticket and was unable to get home to Liverpool.
Jeroen Dijsselbloem said that there will be an economic cost to Theresa May's plan for Brexit.