Thanks very much for clarification, but that's Serco, here we are GCAA, so they probably mean like for all other employees in GCAA ,the first year you are like on a probation period, like back home in my country it was 6 months when you are for the first time employed in some company, it's like you have to show how good worker you are and after you will deserve vacation, and other privileges.
So, here they are applying this for everybody, but like you said after validation you show that you are experienced controller and this is not your first job and from that moment you should be entitled to everything.