In my personal opinion, once you start Student ATCO training, it's not a good idea to take a 'voluntary' break in it, especially if you're with NATS. I don't know their policy on this but I would guess you'll have to do the basic course (or at least part of it) again in order to assess what you can recall from it.
Last edited by chevvron; 21st Nov 2013 at 13:14.