lizplt...
I'm not sure how they are going to assess candidates on the strength of the assessments you have done, i would suggest the other 2 tests are just as (if not more) important...
Also the people who run the Stage 1 events are not NATS people, we contract it to an outside company. I'd give HR a ring and see what they say about it, it may well be likely you get invited to another stage 1 day.
Either way best of luck
Adrian