GIOIA DEL COLLE, Italy: Prime Minister David Cameron made a surprise visit on Monday to the Italian base hosting British jets enforcing a no-fly zone over Libya, and announced four more planes for the mission.Flying into Gioia del Colle in southern Italy, he said Britain would be deploying four new Tornado jets “in the next couple of days” to boost the NATO-led mission to protect civilians from Muammar Gaddafi’s forces.”Which will mean we will have 10 Typhoons for the mission in terms of the no-fly zone and we’ll have a total of 12 Tornado ground attack aircraft involved in operations,” he told reporters travelling with him.Cameron said his brief visit was intended to give him an opportunity to congratulate the Typhoon and Tornado pilots and their crews on “an incredible job”.In his first …