The Border Agency ordered squatters to leave their makeshift homes in Hendon last month.
Dozens set up camp on a disused football ground, claiming they had nowhere else to go.
They were offered flights back home to Romania.
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Aydin Onac has been suspended from his role at St Olave's Grammar School in Orpington.
Leaders of the Aslef union are recommending that their members accept the deal.
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