Sadly the answer is no, except by prior arrangement.
I know that my employer (Big Airways) are all for ATC visits. It's always great to meet you guys.
Nothing left to common sense anymore, can't even let my wife or kids on the flightdeck.
ATB, PTC
PS: Had a sewing kit taken off me at security the other day, just in case I stitched someone to death? But my pen (5 inches long, sharp point, nestles nicely in the palm with 2 inches protruding)was ok. mightier than the needle perhaps?
PPS: Very few of my colleagues have any respect for these regulations.
PPPS: The Tel Aviv suicide bomber (ex LHR employee) could have technically gained flightdeck access as an airline pass holder, but not my wife and kids
Where's the sense in all this? Leave it to the people who know?