The prime need within NATS is for Area Controllers .. what will you do if that becomes their choice of career for you ??
Getting the Aerodrome rating, and then spending a little time with NATS to repay their generosity before heading off some other organisation, is a waste of our time to be frank.
I suspect your desires to use the company as a nice cheap way of funding your own goals will come across in your interviews .. at least then we won't waste a stack of time, money, and the input of already hard pressed instructors at the College and at the units, and can hopefully choose a candidate who actually wants to work with us.
Perhaps now it should be time for NATS to bond trainees for a time period after reaching validation ??