MPs have voted to go ahead with a third runway at Heathrow airport, with 415 in favour, and 119 against.

With an overwhelming majority of 296, the result will come as a blow to local politicians and environmental activists who have fought against expansion at the west London airport.

Prior to the vote environmental activists staged a lie-in over Heathrow expansion plans in Parliament's central lobby.

Police locked-down the area after 12 protesters, who described themselves as from a "pop-up" Vote No Heathrow campaign, sprawled across the floor chanting.

Hannah, an activist who did not want to give her surname, said: "Heathrow expansion is a crime against humanity."

The protest lasted about half an hour.