Nicola Edgington was jailed for life with a minimum term of 37 years at the Old Bailey today for murdering grandmother Sally Hodkin in a knife attack on a street in Bexleyheath.
More top news
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.