yeah, in "28 weeks" it looked relatively believable.
maybe the pilot they used is here on pprune? care to enlighten us?!
From what I recall of that scene in the film, it looked nearly all composite (CG) to me, so I daresay finding the pilot could be difficult!
I'm not sure of the specifics of the Gazelle/Ex-military C of A deal, but I do know that the vast majority of private Gazelles that I have seen recently have all been flying on Yugoslav registrations.
And yes, as a general rule, the use of helicopters in films tends to be in utterly implausible situations, especially if the film in question is a Bond movie!