"though they may well ask a bit about any NATS facilities you have visited as part of the "ATC motivation" competency and that might be an opportunity to show how much you absorbed in any visit(s) you did"
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Thanks a lot for the info, i've already been to heathrow and im going again the day before stage 3 so that should be worthwhile, i'll also have a look into going to swanwick but my time is limited due to work.
Have you got any examples of the questions they asked you about your visits?
Thanks!
Scott