A call was made to Surrey Police by the Metropolitan Police around 9:40am today to say that the 14-year-old, who went missing on 12 September, was at a north London police station.
Her safe return is thought to be as a direct result of the media appeals, and the media and public are thanked for their assistance.
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.