The parents of missing teenager Shelley Pratt say they won't turn on the Christmas lights at their house until she has been found.
Shelley went missing five weeks ago.
She was last seen at around 3.30pm on Thursday, November 8, after she got off a 196 bus on Portland Road outside the Harris Academy.
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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.