Stansted is the airport of choice for the UK government to divert aircraft to in the case of a disturbance or hijacking on board.
"This is because its design allows a hijacked airliner to be isolated well away from any terminal buildings or runways, allowing the airport to continue to operate while negotiations are carried out, or even while an assault or rescue mission is undertaken. Staff at the airport receive special training for dealing with hijacks."
London Stansted Airport - Wikipedia, the free encyclopedia