Retired Orpington businessman, Christopher Tappin, who was extradited to the US over arms dealing charges, will change his plea to guilty, after reaching a deal with prosecutors.
He is set to appear at a Texan court, to enter a plea today.
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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.