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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Archie's mum was fed up with the balloon floating around her living room so suggested he let it go to see how far it could travel.
City Hall wants market traders to embrace new technology in a bid to breathe new life into local high streets.
Dry through the evening and overnight, with clear skies.