The Mayor of London wants to create his own energy company, to encourage investors who want to build mini power stations. By cutting out the big six energy companies, Boris Johnson thinks the Greater London Authority can supply Londoners with cheaper and greener electricity. Martin Stew explains.
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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.