The London Assembly is due to vote this afternoon over the Mayor's plans for affordable housing. Members are currently debating how much landlords can charge tenants across the capital.
The changes would mean that rent on new affordable housing is fixed at 80% of the market rate. Critics say that would make some new properties for people on low and modest incomes unaffordable.
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If approved the increase would trigger a county-wide referendum.
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.
Always bound to raise a few eyebrows, the fourth plinth in Trafalgar square is one of the capital's most famous places to display artwork.