which training?
 

Ive applied for Nats and got through to the first stage. By all accounts, it doesn't take much to get here though. Are the tests as they are on the practice ones and do many people get through.

If you do your training by self funding say ASTAC, is it relatively easy to get it varied at a unit and how would you apply for it?

You will probably get more of a response in the ATC forum section.
Its in the "Ground & Other Ops Forums" section, hope this helps!