The only fact I can say is that the only thing that is truly Bristow about Bristow Nigeria's operation is the colour scheme and company name on their helicopters. Everything else is pretty much different. They try to copy a few things here and there from what's done in the NS but even those are different. I have worked for Bristow in both places and I can tell you this is a fact. If you took away the common colour scheme and company name in all the helis (both in Nigeria and the NS) you definitely would not feel like you were flying for the same operator.
Bristow Nigeria summed up in one paragraph. Bravo