Correct, whoever said it,
Don't run before you can walk!
NATS will love you when you start at the college and you're remark is something like "I can't wait till I finish my training because I'm going to work at Palma".
There is a long way to go before the end of your time at the college, and don't forget you will not get any ratings until you validate them in the UK. You cannot just leave the UK at the end of the course.
Be thankfull that you have been accepted, I'm sure someone who has just been rejected would have given more than you just for the chance to work in the UK.
I can see you are excited about future avenues but think about passing your exams first without the arrogance of assuming you will pass. Then validate your ratings whrever you may be, and then after, say, 5 years experience explore further avenues. Not forgetting avenues will change according to whether you are area or approach, which will not be your descision.
When I worked as an OJTI in ATC the worst thing for a cadet to be was arrogant and assumption. It was the main downfall of many.
ILS 119.5