NTSB statement here:
An Airbus A319-131, registration number G-EUOE, during departure from London-Heathrow International Airport, had the engine cowls from both International Aero Engines V2500 engines separate and fall on to the runway. The pilots reported that they shut down one engine, there was a fuel leak, and that they were returning. The pilots subsequently reported that one engine was shut down and the other engine was on fire. The airplane landed, was shut down, and the passengers were evacuated via the emergency slides.
ENG13WA029