Callum91.
Be very careful about telling them your whole life is about flying. If i were interviewing you, I would be thinking that if you got through and started to get ATCO pay... you would be straight down the route of CPL and adios nats to a flying job.
This happens plenty of times in the selection process. I remember one or 2 at my stage 1 many moons ago bringing their PPL's to the selection test..... never saw them again.
If you get grumpy ATCO man and he catches wind of this.... you will be screwed.
A background in aviation is always helpful for technical exams and some of the face to face ATCO staff, but it is always a double edged sword.
We dont want to have to bust a gut to get you vaild for you to then bugger off. May sound harsh but its what you will get in the interview so be prepared for that.
Best of luck.