An Easyjet Airbus A320-200, registration G-EZUP performing flight U2-8735 from London Gatwick,EN (UK) to Bastia (France) with 129 passengers and 6 crew, was enroute at FL350 about 110nm south of Geneva (Switzerland) in French Airspace when the crew reported a bleed air leak on the left hand wing (engine CFM56) and decided to divert to Geneva. The aircraft landed safely on Geneva's runway 05 about 35 minutes later.