Ariel,
I don't know if this is what you are after, but your computing expertise might come in handy with some of the ATC system providers eg. Thompson CSF (Thales), Raytheon, Hughes come to mind. I don't know who are the major suppliers in UK/Europe. ATC is becoming increasingly dependant on technology, and actually having a system designer who is interested in ATC might be a welcome change.
Good luck with your search.