Same as Moira said....most English people at Eurocontrol start out over here speaking only English. As far as work goes you will have absolutely no problem at all with that. On a social level I have found it incredibly useful learning Dutch, although many expats don't take that step for a long time, not the best race at learning a foreign language are we?
About the NATS thing, that shouldn't be a problem either, the two companies have different procedures and different criteria in the selection process. Plenty of people have failed NATS selection but been accepted here, and vice versa. If you don't mention it, and it comes to their attention that you are hiding it they are bound to ask why? Honesty every time. Also bear in mind that people involved in the selection procedure also peruse these forums....English guy from Southampton...called Andy...how many forms do you think they will recieve in the coming weeks??
Good luck with it mate, hope to see you in the future
