Elandel
Elandel, the bigger picture I am trying to bring across is that it's far better to visit a NATS' controlled tower considering one could meet future colleauges there and also talk about 'NATS' stuff' which should be more relevant in an interview setting if NATS is the organisation you wish to work with.
The 'safety methods' or 'skills' or 'equipment' was just a matter of reference but thanks for your contribution - ZOOKER as well for clarifying it.