With the Libyan regime's forces and rebels squared for a battle around Gaddafi's birthplace of Sirte, British planes taking part in the coalition campaign stepped up their bombardment.RAF Tornados hit 22 tanks, armoured vehicles and artillery pieces over the weekend, the Ministry of Defence said. Early Monday, they struck ammunition bunkers near Subha in southern Libya, according to Major General John Lorimer, the MoD's chief military spokesman. Defence officials said the higher tempo was the result of more intelligence surveillance and assessments from reconnaissance aircraft.