There are some 'new' jobs as I know someone who was taken on, there has also been the apprentices trotted out for the TV. How many are transfers and how many are new I wouldn't like to guess, but I would say that once the apprentice numbers are taken out the new staff (those who are in their first permanent job after qualification) would be pretty low.
It should also be noted that not all the jobs are engineers, as there are back room jobs as well as the boys and girls who get up close and personal with the aircraft.