I really can't see how this can be the problem of the ATCO
I remember our ATCO'S (years ago) NOT bothering about worrying whether an aircraft had safely landed...helicopter...behind the hills...professional crew...always did it like that ....anyway next morning when the aircraft was located up a mountainside in County Louth with no lives left on board......
I ALWAYS checked that the guy had landed safely. I always asked the ATSA to make sure the aircraft captain had a mobile number in section 18/19. We insisted(for example) that the current operators of the ill fated Helo called in......always.
I guess my feeling is that whilst I don't HAVE to worry about it....I always took a professional pride in making sure.
Mad Jock,this seems to have overtones of "over controlling" a la Class G .
I trust you never end up up a mountain in county Louth.